Cute woodland creatures, impossible bank shots, and everything else that could drive you round the bend.
Peggle boosts its irritation factor through the roof by the rule that you can clear the board when you knock out enough orange dots. In the first few levels, this seems okay, because you don't have to hit every single bead, and you feel relieved. In the later levels, the same trick may have you throwing your controller into a sofa cushion, because the special dots will be so tough to reach, the whole thing seems like a joke. It's like a shell game. You are really not supposed to win.
I've actually played pachinko in some game rooms. They also sell tabletop games, which are fun to play at home and at parties. Both of these are a lot better than this pain in the neck.