awkward handshake

I know it's happened to me plenty of times: you go to shake someone's hand, and something goes wrong. Either your hands don't meet in the right spot, causing one of you shake fingers instead of a hand. Or, when you go for a handshake, the other person throws out a fist for a fist bump and you don't have time to change your hand positioning. You both know it's awkward, but nobody says a word about