That depends on your definition of 'often'. Maybe about once a week on average.
It seems you're missing the point. Sometimes that person may interact with my dog without me being present (like in this video), offering no possibility to instruct them about my dogs diet requirements. When I am present, they almost always ask first, and I ask them about the treat. If it's grain free, she gets a free treat. If not, I usually offer the person a grain free treat of my own to give to my dog (person still gets to interact with dog, dog gets treat, every one's happy). I do not rush out screaming at people over mistakes, but I do tell delivery people about her diet and ask them to please not give her the wrong treats, or she'll suffer for it later. They have all complied, but some have needed reminding.
Then there are random people on the street/in the park with boundary issues that just come up from behind and interact with random dogs on leashes without asking, or reach through a partially open car window to pet and feed a dog waiting inside, I find that rude and inappropriate, treat or not. Maybe that's my problem and not theirs, but someone needs to explain why if I'm to understand.
I do it for my dog, not my sense of control. It's not easy, cheap, or fun for me to keep her grain free. She breaks out in hives if she eats too much grain product. It's like someone offering a random non-speaking child some reses...not knowing if child might have a deadly peanut allergy. I understand it's intended as friendly, but that's why you should ask first, it might be harmful or deadly.

It was April the forty-first
Being a quadruple leap year
I was driving in downtown Atlantis
My barracuda was in the shop
So I was in a rented stingray
And it was overheating

So I pulled into a Shell Station
They said I'd blown a seal
I said, "Fix the damn thing
And leave my private life out of it
Okay pal?"

While they were doing that
I walked over to a place called the Oyster Bar, a real dive
But I knew the owner
He used to play for the Dolphins
I said "Hi Gil"
You have to yell, he's hard of herring

Think I had a wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh
Wet dream

Gil was also down on his luck
Fact is he was barely keeping his head below water
I bellied up to the sandbar
He poured me the usual

Rusty snail, hold the grunion
Shaken not stirred
With a peanut butter and jellyfish sandwich on the side
Heavy on the mako

I slipped him a fin
On porpoise
I was feeling good
I even dropped a sand dollar in the box for Jerry's squids
For the halibut

Well the place was crowded
We were packed in like sardines They were all there to listen to the big band sounds of Tommy Dorsal
What sole

Tommy was rockin' the place with a very popular tuna
Salmon Chanted Evening
And the stage was surrounded by screaming groupers
Probably there to see the bass player

One of them was this cute little yellowtail
And she's giving me the eye
So I figured this is my chance for a little fun
You know, piece of Pisces

But she said things I just couldn't fathom
She was too deep, seemed to be under a lot of pressure
Boy, could she drink
She drank like a . . .
She drank a lot

I said "What's your sign"
She said "Aquarium"
I said "Great, let's get tanked"

Think I had a wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh
Wet dream

I invited her to my place for a midnight bait
I said "Come on baby, it'll only take a few minnows"
She threw me that same old line
"Not tonight, I gotta haddock"

And she wasn't kidding either
Cause in came the biggest, meanest looking haddock
I'd ever seen come down the pike
He was covered with mussels

He came over to me and said
"Listen, shrimp, don't you come trollin' around here"
What a crab
This guy was steamed
I could see the anchor in his eyes

I turned to him, I said
"A-balone, you're just being shellfish"
Well, I knew it was going to be trouble and so did Gil
'Cause he was already on the phone to the cods

The haddock hits me with a sucker punch
I catch him with a left hook
He eels over
It was a fluke but there he was
Lying on the deck, flat as a mackerel
Kelpless

I said "Forget the cods Gil
This guy's gonna need a sturgeon"
Well, the yellowtail was impressed with the way I landed her boyfriend
She came over to me, she said
"Hey, big boy, you're really a game fish
What's your name"
I said "Marlin"

Think I had a wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh
Wet dream

Well, from then on we had a whale of a time
I took her to dinner, I took her to dance
I bought her a bouquet of flounders
And then I went home with her
And what did I get for my trouble
A case of the clams

Think I had a wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh

Wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh

Wet dream
Cruisin' thru the Gulf Stream
Ooh Ooh Ooh Ooh

Lucky bastards - oh how I long to eat peanuts!

I love two things about this trailer:

1) They use the Peanuts theme song which is timeless and wonderful
2) The way it looks. Love the art direction and it looks so much like the old stuff but with newer technology.

Hope it's good.

*related=http://videosift.com/video/Peanuts-Teaser-Trailer

The Peanuts Movie - official trailer (2015) has been added as a related post - related requested by PlayhousePals on that post.

Peanuts | Teaser Trailer has been added as a related post - related requested by PlayhousePals.

I really don't like this. But also, it's good to remember that you're driving a weapon. A little bit of fender damage is peanuts compared to personal safety.

Certainly something. Pumpkin juice, another juice or peanut butter. The original video I saw had a bad intro of the guy talking as he puts the pumpkin on the table then coming back out... though it lacked the music.

When I watched closely, it looked like they pre-cut small holes at the eyes (well, the second eye anyway) and nose, and made a deep scratch at the mouth. I guessed that made an obvious spot for the squirrel to eat from without having to get it's own hole going, which seems to be difficult for them on something that size. I couldn't figure out how they got it to move on to the new hole though, so maybe you're on to something with peanut butter? Perhaps a combination of both?
Either way, good trick!

Spread peanut butter in those spots?

When he started talking about his peanut allergy anecdote, first thing I thought was "where was his epi-pen?"

The smart ones do at least for bars. Not too hard to refill with peanuts and skittles. It might be a different story for ones that kids use.

Sorry, you're right. Your one anecdote outweighs the thousands of man hours of research put into this. Tell me, does this restaurant not use soy sauce?

Yes, MSG is harmful to a small number of people ... if taken in large doses on an empty stomach, i.e. like pretty much every foodstuff out there.

And I don't know where you got the idea that the video claims that "deluded MSG haters need to be set straight". It simply states that the prevailing myth about MSG has no basis in fact, much like the other current fad, the gluten free diet

*related=http://videosift.com/video/You-Probably-Dont-Need-to-Be-on-that-Gluten-free-Diet

And meh, you got a headache... so what? People actually die from peanut and shellfish allergies, but most people still eat them. I'm not really sure what your point is, other than to raise a meaningless anecdote about a restaurant that gives you headaches, but for some reason you still go back to.

Ok, I was giving you the benefit of the doubt, but you seem to be serious, so...

You're wrong.

The video debunks exactly what it says it does, the myth that MSG is bad for you, when in fact, it's in all kinds of food.

You got headaches after eating Chinese food from one restaurant; do you know what that means? Absolutely nothing. Your anecdote is completely and utterly irrelevant, unless you've never eaten any other food with MSG in it (like any of the list @Sarzy mentioned).

And yeah, "perfectly safe for the vast majority of people" is a completely acceptable standard. You can pick pretty much any food on the planet and a small number of people will get sick or even die from eating it. But it's "perfectly safe for the vast majority of people". Otherwise, we'd have to ban peanuts, shellfish, gluten, dairy, eggs, soy, garlic, meat... need I go on?

If eating at one Chinese restaurant gives you headaches.... don't eat there.
But don't blame it on some mythical MSG boogie man that was basically drummed up out of xenophobia.