Best "Your Mom" Joke

At work tonight T was playing Just Dance.  He was doing this Mika song "Big Girls (You are Beautiful)" and the shadow of the dancer he was following was chubbier.  T and I watch a lot of Rebel Wilson together.  We've watched every episode of "Super Fun Night" together and we've rewatched several of them.  And we've watched Pitch Perfect three times.  I always stand up when Bologna Barb is on the screen to shield his eyes from it.  But that part makes him laugh and he doesn't understand what's wrong with it.  Anyway.

T's playing this game and he says:
"She reminds me of Fat Amy."
G says:
"You know who she reminds me of?"
T says: 
"Your Mom."

BURN. 

It was terrific.  And it was like T didn't even understand why it was so funny.