If I were riding down this water slide of death, I don't think I'd be smiling, thinking, "Wow, this is so cool! Weeeee"
I'd be thinking that the water wasn't moving fast enough. I'd be thinking that all that separates me from a bunch of flesh eating sharks is a piece of glass and the will of God. A stream of nervous pee would probably be following behind me.
That's what I'd be thinking.