I'm pretty sure Fister understands what NO means (I can tell from his expression), but he'll give it a try nontheless.

He behaves very similar to CJ, he will sit by the door and miaw and miaw - this is always when it's about to get dark outside, and some of you know that that is a bad time to go out! So lately, I've taken the spray bottle out - THAT WORKS! He's gone even before I squeeze the handle.

If I'm patient and listen to him for about ten min. he'll usually give up and walk sulking back to the bedroom.