You might have caught this clip on SportsCenter this morning, I cracked up. NASCAR driver Brad Keselowski and Kyle Busch bumped into each other this weekend and one of them was none too happy: In case that clip gets pulled by the NASCAR brass, basically Keselowski grabs the track microphone, introduces himself and calls Kyle Busch an "ass". Busch went onto to win all the races at Bristol this weekend (Truck, Nationwide, Sprint) and toted a broom in the winner’s circle. When asked about Keselowski’s comments, Busch replied, "Who?". So who cares? Well, it turns out both Keselowski and Busch are both huge Michigan football fans. You might have known this about Busch, who described his fanhood with the Wolverines in this USA Today piece from 2008: Although he is from Las Vegas, young Busch is a big University of Michigan football fan. U of M is about 40 minutes away from MIS in Ann Arbor, Mich. "My brother (Kurt) moved up to Michigan years ago to run in the Craftsman Truck series and he went to a Michigan game," Kyle recalled. "He bought me a Michigan sweatshirt and sent it home for me. I never really paid attention to college football until then, but I became a Michigan fan. Not too complicated of a story, but it’s fun to…