Haven't seen those in particular, but the general idea is pretty old. I remember this page from 10+ years ago.

Personal favorite:
PESSIMISM
Every dark cloud has a silver lining, but lightning kills hundreds of people each year who are trying to find it.

Yeah, I remember this one from 1999.

Hey Bill, you should also do a routine on how airline food isn't great and how white people do things that black people don't!

I had 4 Demotivators at my desk 12 years ago:

I put this one up for our $280/hr consultant who managed to make the system less useable, less stable, and/or less maintainable every time he visited.

I put this one and this one up for my boss who routinely threatened to fire everyone or kill everyone when he found out that we were implementing his moronic "vision" to the letter and that it would never work.

Lastly, my person favorite, for the entire MIS department, because everyone's most refined skill was finger-pointing.

Not as funny as the all of demotivational posters all over the internet for the last 10 years.

Yeah, Bill, still getting your bit ideas from HuffPo?

My fave of all time. The write-up is pretty clever, too.