I would recommend Nyquil rapido
you will need:
* one shotglass for each participant
* one thin towel of some sort for each participant; thicker than bounty, thinner than your bath towel (a kitchen towel is magnificent)
* seltzer water
* nyquil or comparable brand - feel free to experiment with different flavors too, fagit!
pour the seltzer into the bottom half of the shotglass. pour the nyquil into the top half. fold towel over top of glass. in one swift motion, take the shotglass, lift it into the air, then slam back down onto the table. quickly lift towel off of shotglass, then drink contents as they fizzle. if they're not fizzling, you're a fucking moron or you've done too much - which is kinda one in the same.