you'd think it would be a great story but its not that interesting. we ate taquitos and had him drink the powdered laxative and my friend and i were laughing but sadly he didn't get instant laxative so nothing really happened and we just sat around drinking and laughing to each other about it. the next day he was like DUDES HOLY SHIT DID EITHER OF YOU HAVE THE MOST MASSIVE FUCKING TACO SHITS EVER or something like that and we laughed and i think he still doesn't know.
My friends and I did something similar once, except it involved a very annoying little kid and some laxatives in chocolate bar form. I wasn't there for the end result, but I'm told it wasn't pretty.