The pharmacist walked into his store to find a guy leaning against the wall in obvious discomfort. He asked the clerk, “What’s with that guy over there by the wall?”
The clerk replied, “Well, he came in here this morning to get something for his cough. I couldn’t find any cough syrup, so I gave him a bottle of laxative.”
The pharmacist yelled, “You can’t treat a cough with a laxative!”
The clerk responded, “Of course you can! Look at him. He’s afraid to cough.”
Thanks to Grannymar for this one.