The owner of this drug store walks in to find a guy leaning heavily against a wall.

The owner asks the new clerk: Whats with the guy over there by the wall?

The new clerk responds: Well, he came in here this morning to get something for his cough. I couldnt find the cough syrup, so I gave him an entire bottle of laxative

The owner, wide-eyed and excited shouts: You idiot! You cant treat a cough with a bottle of laxatives!

The new clerk calmly responds: Of course you can! Look at him, hes afraid to cough.