For his recent appearance on Ellen, Bruno Mars agreed to pull a prank on an unsuspecting nurse. The gimmick is basically this: Mars repeats exactly what Ellen tells him through his earpiece.
Mars tells and asks Deborah the nurse a number of ridiculous things, like:
"I haven't swallowed since the Super Bowl."
"Why do Pringles come in a tennis can?"
"How many throats have you looked at?"
"It also hurts when I go [makes chicken noise]."
And that's before he starts to cry. All in all, Deborah the nurse is a good sport about it. Plus, she got to be on Ellen.