What is moose knuckle? It's when we can see a man's ballsack in the bulge of his tight pants! What better way to start our week than with a rundown of classic moose knuckles from celebrities.

Matt Damon in The Talented Mr. Ripley

It's Moose Knuckle Monday!

Sacha Baron Cohen in Borat

It's Moose Knuckle Monday!

David Bowie in Labyrinth

It's Moose Knuckle Monday!

Justin Beiber in Calvin Klein's Underwear Ad

It's Moose Knuckle Monday!

Idris Elba in Mandela: Long Walk to Freedom

It's Moose Knuckle Monday!

Tom Cruise in Magnolia

It's Moose Knuckle Monday!Peter Hinwood in Rocky Horror Picture Show

It's Moose Knuckle Monday!Matt Bomer in American Horror Story

It's Moose Knuckle Monday!

And even more Matt Bomer in Magic Mike!

It's Moose Knuckle Monday!