#1 Go over Niagara Falls in a barrel. Why on earth not, you might ask? Anyway, the first person to survive a trip over the falls was a woman, Annie Edson Taylor, in 1901. Good for her.
#2 Go bungee jumping. Besides my fear of heights, I have this thing about how the jump must affect your joints particularly the ankles, as in, not good for them. I also will never do the walk around the outside of the CN Tower tethered onto it somehow; it's called Edgewalk and I understand they have several months waiting list for people lined up to do it. Not me. You will never find me hiring a helicopter to take me up a mountain so I can ski the sheerest of cliffs down. I guess I could have shortened this one just to say any extreme sport or anything involving heights.
#3 Driving with the window down and my arm stuck out. Do you realize how many people have sheered off an elbow that way? Apparently quite a few. It just gives me the shivers to think about it. I bet those people were not driving a Corrolla or a Honda Civic, though. Strikes me it would have to be something cooler.