That is NFL Hall of Famer and current Pac-12 Network analyst Ronnie Lott showing his unfamiliarity with the set at Pac-12 Network.
The good news is Lott is OK, and he actually got up and finished making his point afterward. However, even though Lott's OK, we shouldn't overlook the extreme danger in this gif.
Chairs on wheels. Oh sure, they seem like fun, but did you know that chairs on wheels kill millions of people each year?
Be careful out there, friends. You could be the next victim of a chair on wheels.