Halftime, B12 Rec League Game.
A Coach comes up and says, "Ref, you gotta watch B5.  When he sets his screens, he jumps into the player and hooks his arm and has a tendency to hold."  
I said, "I haven't noticed it, but I'll keep an eye out."
He says, "Seriously, he does it all the time.  I know, I taught him last year when he played for me.....  He's crafty about it too."