Ellen's not the only one who can play a prank.
Bradley Cooper gave The Ellen DeGeneres Show host a taste of her own medicine on Tuesday when he showed her his third, fourth and fifth nipple.
"Hey, do you remember when you asked me last time if I could take my shirt off?" the Silver Linings Playbook star asked, eliciting cheers from the crowd. "I remember thinking—well, I don't know if I should reveal this much about myself."