When a friend of mine was approached with a difficult physics problem, this is how he effectivly solved it:

Question:
A rifle is aimed horizontally toward the center of a target 100m away. If the bullet strikes 10cm below the center, what was the initial (only horizontal) velocity of the bullet? What is the velocity vector of the bullet as it strikes the target?

Answer:
Due to an anomaly in the space-time continuim, the bullet actually hit the target before it left the gun, causing a paradox because there were two exact bullets, and subsiquently, the dimension was destroyed. Hence, the problem is unsolvable. If there was an answer, it would be 7.

Amazingly and coincidentally, the acutal answer was around 7.4