The owner of a chemist walks in to find a guy pushing his back against a wall. The owner asks the clerk "What's with that guy over there by the wall?" Clerk "Well, he came in here this morning to get something for his cough. I couldn't find the cough syrup, so I gave him an entire bottle of laxative". Owner "You idiot! You can't treat a cough with laxatives!" Clerk "Oh yeah? Look at him... he's too fucking scared to cough!"