Comedy Central's Jon Stewart and Stephen Colbert had a little fun on Thursday with the squiggly signature of Jack Lew, Obama's nominee for Treasury secretary.

"That's your signature? Or are you just testing to see if the pen works?" Asked Stewart on "The Daily Show." He added: "Hey Lew, here's a tip: Stop signing all your checks on the teacup ride at Disneyworld."

On the "The Colbert Report," Colbert asked: "Is this even a signature, or did he just draw Charlie Brown and give up after the hair?"

Check out the jokes below.