As mentioned, there are few drinks not enlivened by a few pellets of dry ice. (Not strictly food related, but if you drink half a bottle of coke, bung in several pellets of dry ice, and seal it tightly, be sure to throw it quickly before the resultant sticky armageddon consumes you). Liquid nitrogen can be used to make very good vodka cubes. With a little addition of pure ethanol and a bit of craft (it's a two step process to create the required alcohol gradient), you can make burning frozen vodka cubes. Not strictly useful, but quite literally hellishly good fun. They also slide really well along benchtops. Drinking lab alcohol is naughty of course, but burning it is perfectly fine.
Arabidopsis is a good substitute for mustard cress, works well in omelettes, salads and sandwiches. Remember to label the radiolabelled stuff well though, unless you want to scintillate. We never tried screening mutants for taste. For some reason, the damn grant people didn't want to fund that one.
Drosophila don't taste of anything. Which is good, because the little buggers tend to get everywhere.
There were always tales of lab rat BBQs and the like. But frankly, the only people stupid enough to do that were medical students, which is why they have to be segregated from the general population.
