alcohol fire in the vinyl tub it looks like...hey dotdude...ever seen a "whoosh"? Reminds of this, cept' you use a glass carboy, lie used in beer brewing or the old school, five gallon, water bottles...

Directions:
Get one of those bottles.
Pour a smallish amount of grain alcohol, or 90% isopropyl, into the bottle, 'bout 2 0z.
With one hand over the top of the carboy, to keep liquid in, swirl the alcohol in the bottle, to coat the sides thoroughly, up to the neck.
Place bottle on floor, and using a butane lighter, (or match), light the top till it starts.

The result, is a wave-like circular flame, traveling from top to bottom, with a resulting sound from the pressure created and released through the top, "WHHHHHHHHHHOSH" hence the name-

if you are lucky, the wave will begin to travel back and forth from the top to the bottom, and pulsating sounds will be produced, like an engine backfiring softly PFFT PFFT PFFT PFFT PFTT faster and faster till the fuel is all used.

Great Trip Toy with all the lights out.

you are welcome in advance, if you do not already know how to do this......impress the girls, and amaze yer nurse, er friend(s)!!!

better idea fellas....get a plastic carboy, like an Ozarka bottle, and scale yer fun up a notch or two.....you will need,
1 pound dry ice for the bottle......(simply a suggestion)

My guess: the probe/rod he was using was inside the neck of the carboy, preventing the gas from escaping through the neck fast enough to keep the internal pressure lower than the breaking-point of the glass. Had he not been obstructing the opening all would have gone to plan.

...but yeah, safety goggles would have been a good idea. That whole thing could have turned out much, much worse.

Bozo's got a flask bubbling away on a hot plate, is inserting a flame into a GLASS carboy, and has ZERO eye protection on. Bozo got lucky this time.