What’s going on on the floor? Lady Gaga found out in Houston over the weekend, as she took a nasty spill onstage during a performance of her Mutt Lange-production-to-be “You and I.” Mother Monster was in the midst of doing her super-rock-and-roll windmills on top of her piano when her bench slipped out from under her and she crashed to the floor. To her credit, Gaga played it off rather well, continuing to sing on her back, and still making it to her spot at center stage for her big a capella moment. Hey, not even the pro-est of pros can avoid getting egg on their face every once in a while. You clean it off and move on.