Funny you mention that, I havent decided on any future cars, but I have been thinking about a vanity plate for my current one... 
SK3, BENZ, FUIG, GFYIG, SKTO, MG, PJ, SCAM, BASHTHIS.

How funny would it be to walk up to your sweet car each time and see FUIG? 

I think I'm going to keep adding to this list for fun this weekend.