Friends of Howie Mandel, beware: The "America's Got Talent" judge is not afraid to prank his colleagues and embarrass them on Facebook.
"AGT" host Nick Cannon learned this lesson the hard way when Mandel posted a photo of Cannon sleeping on an airplane, in front of a collage of his ex Mariah Carey.
Mandel published the snap to his Facebook and Instagram pages, doubling the humiliation. He captioned the photos: "Wait until @nickcannon wakes up to see collage I made him."
Mandel taped several photos up behind Cannon's seat of the singer at different points of her career, all while Cannon slept peacefully. Carey probably didn't find the joke funny, but at least the pictures of her were attractive.
Unfortunately, Mandel did not follow up with an update on Cannon's reaction.