Having paddled S. Silver (in a creek boat) I've got to say that Fletcher is a way braver man than me... and apparently much more impervious to pain. Ouch! Being upside down in a kayak anywhere in there is not optimal. Sliding down all those drops on his butt, knees, back, face, hands, etc. looks completely miserable.
Good on him for doing it though. Glad to see there is still some senseless fun to be had just for the hell of it. Go Fletcher!