I changed the oil in a guy's Grand National that had a plate that read QuickSix. I asked him how quick and he said "I can drive up to the racetrack and average 19mpg, run a nine second quarter on the tires I showed up in, and drive home."
My mom's Infiniti G35 has one that says BPDSRT for my dad, which stands for Bethany Police Department Special Response Team. I had a friend with an older Silverado who's plate said BLOWN92, I'm sure you can figure that one out. The only other one I can think of is a Toyota Prius that said JNMCAIN on the back. I had to laugh at the irony.
My turbo lag is your courtesy head start.