[VRWCmember]

Forgetting that when you point the finger at someone, their are four other fingers pointing back at you.

Actually there are three. The thumb is probably pointing down, slightly forward, to the side, or up. To get the thumb pointing back at you requires some rather painful contortion.

[Palladin]

Well, I can't draw my image of it, but the thumb is down and back, like in the Uncle Sam poster of "I want you".