Years ago I was at a pub in Galway and was waiting to get served at the bar when I noticed a man staring at me. He came up to me the next time I was at the bar and asked if I was Billie Piper.
Shocked, and a with a few drinks under the belt, I said 'yes, but please don't tell anyone.'
He was pretty intoxicated and said 'oh, no problem. Is Chris (Evans) with you? Where is Chris?
I replied that he was in the nightclub 'pissed as usual'

So, anyone else been mistaken for someone famous or a 'sleb'?