Best:
I was innertubing down this huge hill, and while we were climbing up it, someone decided to build a jump at the bottom. We didn't realize we were gonna hit a jump until about halfway down, so we were shocked. We went airborn, probably about 6 feet or so, and as we were coming down, my friend hit a chick. Funniest thing I've seen in my life.
Worst:
On the same hill, 3/4 the way down, I hit a tree going full speed. Ouch!
---Brent