WATCH: Lisa Wilkinson cracks up on live TV after Tommy's X-rated remark
As well as fulfilling Carrie's dream of seeing the Spice Girls play live, Tommy indulged in some quirky British customs during their overseas trip.
Tommy, 34, shared footage of himself riding naked on a bike through London (as part of the World Naked Bike Ride) during The Sunday Project segment.
Which was all too much for Lisa to handle.
Tommy's manhood was obscured from view in the images, but he made sure Lisa had the full picture by describing some of the comments he'd heard during his breezy bike ride.
"One woman, she was heckling from the side, yelled, 'He's a grower, not a shower!'" Tommy revealed.
I'm not sure what that means!" Lisa replied, looking to Waleed for backup.
"I think it means I've got a small c**k," Tommy quipped.
Which was the final straw for Lisa.
"I'm done. I'm done," she said, in fits of laughter.