During Jamie Foxx‘s performance at the Angel Ball in NYC Monday night, Tina Knowles jumped on stage to show Foxx what she’s working with. What starts out as an innocent looking dance turns into her booty winding and grinding offly close to Jamie’s crotch. Well, what’s a man to do? He politely backs off because let’s face it, it’s Jay-Z‘s mother in law! But I do see a few beads of sweat during the process. Check out the video above!