Uh-oh — Meredith Vieira might find herself in a full-on prank war with Matt Lauer!

The talk show host trashed his dressing room and left her former TODAY Show co-anchor a 'sweet' message before he appeared on her new self-titled talk show on Thursday, Nov. 6

"What is her problem," Matt said through a fit of giggles in response to the prank. "She is really nuts."

Watch the funny video below!