There was a guy skateboarding yesterday. He was just standing on the sidewalk in front of one of the buildings trying to do tricks. Then someone shouted (to someone else i thought?) and he just looked at them for like a whole minute. He was weird.

Riding a bike during winter is like a recipe for frozen eyes. You have to have a lot of control to avoid hitting people (not everyone is successful that I've seen) so to do it while your eyes are watering and your hands are cold, etc ust sounds like a bad idea. There are a few people that do it (out of necessity maybe?) and they look pretty miserable.