Chris' device with which he wants to launch a cow though ultimately launches a piano is referred to as a catapult but is actually a trebuchet.
The Sistine Chapel took 4 years to paint, not two.
Ed describes the action in Monty Python and the Holy Grail (1975) as crusaders flinging a cow into a castle over the wall. The film is set in 932, 163 years before the First Crusade and in the movie, the cow is flung from the castle towards the knights who are outside the castle.