Haha indeed I knew that one with another plot, that went like this: A brit, a french, an american and a mexican are flying in an airplane over the mountains. One engine dies and they have to throw weight, but there are no parechutes. So the brit opens the door, yells "Remember Trafalgar!!" and jumps out. Some time later another engine dies and they have to throw more weight, so the french opens the door, yells "Remember Austerlitz!" and jumps out. Unfortunately, another engine stops and even more weight has to be thrown. So the american opens the door and yells: "Remember El Alamo" - and throws the mexican.