I don't have much to say on this, honestly, but I do think it would be interesting if, when you enter a room, if someone on a skateboard is leaving at the same time i.e, moving past you, you crash into each other. Perhaps the rider falls off their board, perhaps it continues on into another room. But whatever the case, there would be injuries.
This makes sense to me in the context of doors in particular, where there's only so much room to pass through.
