O'57

Ahh... although I numbered the list, in no way was it in any order of preference. If it had been then perhaps the scene from The Wicker Man would have been first..

Interesting idea about the cutting hand... let's see if there are any other notable movie scenes that would justify such gestures. Off the top of my head, and in no particular order - and probably not literal quotes:

Cutting hand

1. "Would you like to come up to the house and eat with me and mother?" (Norman Bates in Psycho)
2. "It's probably just as well that you are leaving. You wouldn't want to be here for our May day celebrations." (Lord Summerisle to Sergeant Howie in the Wicker Man)
3. "Johnny Ola showed me this place one time." (Fredo Corleone to his guests, including his brother, Michael in The Godfather Part II)

Waghand

1. "'Fair maid', said he, 'your kettle's cracked, the cause is plainly told. There have so many nails been drove, mine own could not take hold'" (Lord Summerisle singing at the piano in The Wicker Man)
2. ".. and now you're going to die in that silly little hat, what do you think about that?" (Defens to a dying golfer in Falling Down)
3. The scene in which Principal Ed Rooney, runs down the school corridor pausing periodically to casually walk past the classroom windows, in Ferris Bueller's Day Off.

Clench fist

1. Everything that Ernst Stavro Blofeld says in From Russia With Love, but especially "Twelve seconds... one day we must invent a faster working venom", "Siamese fighting fish...", "We did not bring you over from the Russians just for your amusement, number 3" and "Let his death be a particularly unpleasant one".
2. "This wire can cut meat and bone easily" (Asami, looking at her wire saw in Audition)
3. "I want a suite at the Royal hotel. A shower, a shave... the feel of a suit." (John Mason in The Rock)