Warning: This is a somewhat crude topic involving laxative. A few of my friends and I are all hanging out tomorrow night. One of them is known for the cruel pranks he likes to play on us, so we want to get him back with some laxative. It won't be completely inhumane because we'll be at my house all night and he'll have easy bathroom access. I was thinking of making a batch of muffins or something and "specializing" the one he gets. Now we don't want to make him terribly ill, we just want to send him on a lengthy bathroom voyage. I don't know much about laxatives or if there are bad effects (other than diarrhea) from taking it when you don't need it. Have any of you ever laxative pranked somebody? How much should we slip him and what kind?