I found this pretty funny:
Rugby is pretty simple, there are two rules:
1) Beat the crap out of the opposition.
2) Don’t let the referee observe you beating the crap out of the opposition.
Oh, and there’s some shizzle about not passing forward or running off the pitch, but that’s all secondary to the two main rules.
Fencing rules SHOULD be:
1) Stab the other guy.
2) Don’t get stabbed by the other guy.
Of course, the two very young children I’m watching over didn’t quite understand my giggling.. but they joined in anyway.
(Rules blatantly lifted from here)