A few months ago, I saw photos and articles about a guy who kayaked over some 127ft waterfall in Brazil. Then, a few weeks later, another guy ran a 198ft waterfall somewhere near Spokane, Washington. Now it seems like there are more and more reports of people running waterfalls with dimensions once thought to be a death wish as people have died at smaller waterfalls.
Apparently, an extreme sport involving waterfalls has emerged and may start entering the mainstream in much the same way you hear about big wave surfers.
This article goes into a little more depth about kayaking waterfalls, and why it's really taking off now.