A man walks into a chemists, buys a condom, then walks out of the store laughing hysterically. The chemist thinks this is weird, but, hey, there's no law preventing weird people from buying condoms. Maybe it's a good thing. The next day, the man comes back to the store, purchases another condom, and once again he leaves the store laughing wildly. This piques the interest of the chemist. What's so funny about buying a rubber, anyway? So he tells his assistant, "If this guy ever comes back, I want you to follow him to see where he goes." Sure enough, the next day the laugher is back. He buys the condom, starts cracking up, then leaves. The chemist tells his assistant to go follow the guy. About an hour later, the assistant comes back to the store. "Did you follow him? Where did he go?" asks the chemist. The assistant replies "Your house."