I don't chop.

If it's folded to me in the small blind I usually raise or fold.

If I'm in the big blind and it's folded to the small blind and he asks me to chop I politely say, "No". This usually stuns most people and puts them on a slight tilt. Many will fold, some call. Sometimes when they call I raise. This usually unnerves them a bit also.

Forget chopping etiquette and PLAY POKER instead. Anyone who even considers chopping is screaming that they are afraid to play shorthanded. You'll hear every lame excuse in the book (... it slows down the game ... the rake makes it -EV for everyone ... it's just a friendly game ... blah blah blah ... BLAH BLAH BLAH ...). It's all nonsense. They are afraid to play shorthanded. Period.

This has been very profitable for me and creates a great table image. It intimidates a lot of players and tends to make them play more straightforwardly when they are in a pot with me.