You have two containers, one which can hold 11 liters of water and the other of which can hold 13 liters. You also have access to a sink with a faucet. You can do any of these three things as many times as you like:
Given these conditions, is it possible to measure out exactly 8 liters?
If this puzzle seems familiar, it might be because a version of this challenge was featured in the third "Die Hard" movie.