Oh, and I once played a character called Bill the Giant. In my defence, he wasn't actually a giant, he was a half-dragon. My fellow PC asked "what the hell are you?" and I did the whole "I'm a giant" schtick, viz:
*Me: I'm a giant.
*Other PC: You're too short to be a giant.
*Me: I've been ill.
It was an old gag, but the other PC went with it and from that point on I was a giant as far as everybody was concerned. I forget where "Bill" came from, but for the entirety of the campaign I remained "Bill the Giant", despite neither being appropriate.