context: A surfer showing off his talent in public using a man-made water machine.
hypothesis: It is probably not the case that a surfer is in performing at a charity event.
valid_hypothesis: It is probably not the case that a surfer is in performing at a charity event.
invalid_hypothesis: There is a very good chance that a surfer is in performing at a charity event.
hypothesis_assertion: A surfer is in performing at a charity event.