When Matt Cassel was with the New England Patriots , he wasn’t just backing up Tom Brady . No sir. He was locked in a full-blown prank war with him. It started with Cassel’s habit of swinging the quarterback-room door open, something Brady warned him about, saying it would eventually nail him. Cassel ignored it. Which is exactly why Brady braced his foot behind the door the next time Cassel tried to walk past. Cassel’s lunch went flying, and the situation with the hungry and annoyed backup QB escalated fast.

In revenge, Cassel dumped protein powder in Brady’s sneakers and rubbed muscle balm into his underwear. A few smaller pranks followed until Brady had enough. The seven-time Super Bowl champ then fired a protein shake at Cassel, who, in return, answered by dumping an entire t

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