Driving: 180kmh on a dirt road in the parents 4x4..
sad thing is the dirt roads round here are safer to drive on because they are smoother than the sealed ones.....

Motorcyle: bout 120kmh on my brothers yamaha bansee (quadbike). 6th gear pingin then back off a bit and throw it into the drifting track around the gravel roads along the creek!

Passenger: 180 in an R33 skyline (only 4th gear), when the bloody factory limiter kicked in.