Lots of us enjoy a good pun - probably me more than most. There's something about a good play on words that makes you throw your hands in the air and go WAYHEY! After all, it's the main thrust of my stand-up routine whenever I get chance to do it. But there are many jokes that tend to not get used because either they need a bit of thought or because the average person (whoever you deem that to be) may not get the reference points in the joke. For example:-
I bought a book called 1001 things to do with binary. It only had 9 ideas in it.
Not original I know, but it gives you the idea.
So, let's have your jokes that require engaging of the brain!