Grizzly was doing his regular nightly run, in laps around the pigloo. Bean was sleeping inside. When he woke up, I guess he forgot what usually is going on at cleaning time. He stuck his head out to see what's happening and Grizzly ran right into his face.
Beanie didn't actually seem mad, though. No teeth chattering or anything. The pigs often run into stuff when they're going high speed, so I guess he was used to it.