A U.S. Customs agent and her dog are on a plane. After it takes off, the agent turns to the dog and commands, Sniff. The K-9 trots down the aisle and sits next to a teenager. It then returns to the woman and puts one paw on her arm. Is that dog checking for drugs? asks a man sitting beside her. Yes he is. He just found someone carrying marijuana, she explains. Well arrest him upon arrival. Wow! replies the man. She again commands the dog to sniff. It trots back down the aisle and moments later races back and craps all over the place. What happened? yells the man. The agent screams, He just found a bomb!