Go watch this right now.
It's totally SFW, though you might want to turn your speakers down.
I think the most amazing part of this video isn't necessarily the 50 mph skateboarding. It's how well the roads in Claremont are maintained. If these guys tried this in SoCal they'd get about five feet before destroying themselves on a pothole.
Instead, they're NorCal. So they're just destroyed on pot. Either way I'm impressed.