I think more random people have been "jumping in" lately. It's obviously choreographed / synched with the Ravens officially in some way. That said, if they're going to keep putting him on screen like that, maybe they should have a couple ushers flank him for 30 seconds each time. Just get out of his way people and let him do his thing... the Ravens are putting the camera on him (not you) for that brief moment, whether you like it or not.
And most probably know this but maybe some who don't go often don't, but he's been doing it for a long time. It took many, many years before the Ravens decided to start making his routine part of the in-game video production. We sit in the endzone near the same corner. Once in a while he'd travel to different sections throughout the game. Popped up in front of ours a few times. He set the bar too high though... I don't even bother paying attention to him UNTIL the shirt comes off... THEN you know it's serious.