Motorbikes. There's something about muscling a 1000cc bike around a corner, knee dragging on the road, your head 18-24 inches from the ground, both tyres sliding in a controlled drift leaving black marks, even if only for 2 seconds & lifting it up to fark off to the next corner to do the same totally defying gravity & everyones perception of normal physics of how fast a bike can go around a corner. The down side is I am carrying the scars from when it can go wrong so I have retired my immortal tendencies.