Climbed out the passenger window onto the hood of a car that was doing about 70 on the highway. In the rain. I didn't really have a reason. I just knocked on the windshield.
Climbed into a shopping cart and rode it down a hilly street. They stay surprisingly straight. A car started heading my way so i had to hop out. My friends tell it like I was doing 70 mph. It was probably closer to 30. Gotta a hell of a road rash from that one.
Skied behind a jeep through a cornfield. Cut the shit out of my legs. That was really dumb. That shit hurt.
There's more., but you get the point.
Maybe not as dumb as lighting your face on fire, but I've had my moments.