Some advice from a friend:
Richard over at Tales of the Golem; or, the Modern Epimetheus claims to have “convincing experimental disproof of Pythagoras’s theorem!”
In the first picture, the water covers the area a^2+b^2 while in the third picture, it covers an area larger than that of c^2. Thus, a^2+b^2 > c^2. Guess all of mathematics was wrong!
(via Unknown Source)