Now this is fun, you can make your own license plate. These are mine:
"TARDIS" (Time And Relative Dimensions In Space, which is a registered trademark of the BBC) is for the Mazda Tribute, it's massive when you put the back seats down. Bigger on the inside than on the outside, dimensionally transcendent, and jolly fast, especially when you pop the overdrive off and floor it.
There is probably a license plate "404 HTM" driving around somewhere in Missouri, I've seen ones ending in HTM all over the place, and I want it!