The owner of a chemist walks in to find a bloke leaning heavily against a wall with an odd look on his face.
The owner asks the assistant, "What's with that bloke over there by the wall?"
The assistant says, "Well, he came in here at 7am to get something for his cough. I couldn't find the cough syrup, so I gave him an entire bottle of laxatives."
The owner says, "You idiot! You can't treat a cough with laxatives!"
The assistant says, "Oh yeah? Look at him - he's afraid to cough!"