When I was a wee laddie, we didn't have parents with slabs o cash to buy us dirt bnikes and such so the urban sport was taking a waxed cardboard box and sliding down the grassy embankments of the highway overpasses. Lots of fun until you got tossed off and got major butt burn from the grass.

We also used to take (steal) Big Wheel kiddie trikes, mount a (stolen) Briggs & Stratton lawnmower engine on 'em and rig a bicycle crank gear on the axle of one of the wheels and go into the construction site for the new University and go racing in the Mechanocal tunnels.

The Security guards were all old codgers and we could out run 'em on the trikes until one of 'em got the idea to use a Fire Hose to knock us out of action! (Damn that hurt!)