Anderson Cooper gets punk'd

May 11, 2011 at 10:59 a.m. ET

Anderson Cooper got punk'd on the air when CNN staffers played a prank with one of his childhood photos.

Good thing Anderson Cooper has a sense of humor -- the CNN newsman was at the receiving end of a hilarious prank at the hands of his staffers!

Anderson Cooper

Cooper was in the middle of a story about how Justin Bieber is a brat when a fabulous photo of a then nine-year-old Anderson flashed on screen. The best part? He was dressed in a sparkly purple and silver jumpsuit and a fluffy purple hat.

"Wait a minute, wait a minute, wait a minute," Cooper interrupted Isha Sesay. "Did we just put a picture of me when I was like nine years old on To Tell the Truth? About Justin Bieber being a brat, are you saying I'm a brat?"

"I'm being told in the control room it was a technical glitch, I don't believe that for a second... I'm not hearing anything, I'm just thinking about people I'm gonna fire," he joked.

The Silver Fox explained his strange getup. "I was pretending to be Wally Norden, the world's youngest bear trainer."

Um, okay. Whatever you say, Coop.