I remember being a 13 year old kid, buying Weider Mega Packs. (A can came with 30 separate packs of many vitamins).
I took one as I walked home from the mall (thinking I was gonna be huge) with a large soda to wash it down. BY the time I got home, I had to make a mad dash to the bowl (massive stomach cramps).
I threw the other 29 packs in the garbage after that :>)