Different/interesting ways to say I QUIT

Forget it !

Burn him and he might burn you for the rest of your life.

What if he calls your new boss? You may be gone from there too !
If they don't fire you, you'll be on the short list.

If they change their mind about hiring you, and choose one of the many other applicants, how will you get another job ????? In this economy !
Big hole in your referencees.

We all go through bad bosses. Don't let him know he got you.

Move on and up and never look back.