Karl Stefanovic officially lost the plot over Lisa Wilkinson's new blouse.

It’s hard to believe it’s been five years since Karl Stefanovic had to excuse himself from his Today show hosting duties because a ‘long, stabby thing‘ reduced him to a giggling mess.

Of course, we’ve seen him chuckle since, but he’s never been quite so incapacitated by laughter. Until today.

It began with an innocent enough comment about co-host Lisa Wilkinson‘s new blouse.

“That shirt just goes on … Oops sorry,” he said as he grabbed the long tie hanging from her neck (known as a ‘pussy bow’, for the uninitiated) but ended up grabbing a little too close to his co-host’s lap.

Cue the innuendo.

At first Karl was chastised by Sylvia Jefferies, but Lisa made it clear she was comfortable with the attention.

“He only touched my pussy bow,” she said. “It’s okay. But my pussy bow goes all the way to the floor so it’s a good thing you didn’t touch it all the way to the floor.

“How long have we been together? Nine years. You’re allowed to touch the pussy bow,” she added.

“Some say too long, but I don’t,” Karl managed to squeeze out through uncontrolled silent laughter.

“I started to sweat.”

Lisa thoughtfully handed him a tissue to mop his brow… probably so he wouldn’t use her pussy bow.