Is there any way to tell my boss to get lost relatively politely? He is a family friend and (being slightly conscientious) I will feel [slightly] bad if I just tell him to get lost.

He's stressy, very annoying and has me working like his slave at the moment, and I'm currently waiting for the perfect moment to quit. Give me ideas and I'll be forever grateful!

I'm sure everyone could do with ways to tell their to get lost right? And funny suggestions are also wanted, if not for anything but to get me in a better mood when I get home from work =D