We're a bit miffed.
Over here in Bristol Traffic HQ we endlessly debate the best personalised number plates we'd like on our vans and 4x4s. We've even got one on the company Porsche.
We know that the really good ones have all gone (we've still got PEN 1 S on the Bentley, and D 1 LDO on the X5, mind), but we were really upset when we received this photo:
Yep, that's UPU51R, spelling out it's owner's attitude to other road users in a really succinct and pithy way. In Clifton. Nice.