It's fun, but best of all it's really safe.
Is there a way to know for sure how thick the ice is before one ventures there? I wonder whether if sections of the river/ice underneath the bridges are not as hard-iced as the others? Kinda cool but scary.
@Jack: I've lived in icefishing territory before. You drill to measure ice thickness.But these guys probably just saw the other people playing on the ice and decided to go for it :-)