A man walks into a pharmacy and asks for a pack of condoms. As soon as he has paid for them, he starts laughing and walks out. The next day, the same thing happens-the man asks for the condoms, purchases them, and walks out laughing. The pharmacist thinks this is odd and asks his assistant that if the man returns, he should follow him.

Sure enough, the man comes into the store the next day, repeating his actions again. The assistant duly follows him out of the store. Half an hour later, he returns.

"So did you follow him?" the pharmacist asks.

"I did," replies the assistant.

"And...where did he go?" asks the pharmacist eagerly.

"Over to your house, " the assistant replies.