If you've ever been to Wrigleyville for a Cubs game, you probably recognize Billy Cub. He's always outside the stadium taking pictures with fans and, even though he's not the Cubs' official mascot, he's a tradition!

After watching this video though, we know never to mess with him!

Apparently Billy Cub was hanging out with fans in John Barleycorn on Clark St. over the weekend when somebody decided to pull his costume head off. 

What happened next wasn't pretty....