I am tempted to say go fish, it is a really simple (and fun) card game. their is also a game I like called old maid (it's another card game dating back to the victorian era)

but I'm going to say pop-up pirate. it was a game I played a lot as a kid... you put the swords in the pirate, and then if you put your sword in and the pirate pops up from the deck of the ship, then you lose. their are loads of games like that.. their's crocodile dentist, kerplunk etc etc

what is something you would really like to understand, or grasp, but no matter how hard you try you can't seem to get it?