A winner is you.
I went to McDonalds years ago with my mum, we ordered whatever and then asked for 2 hot apple pies...
McGirl : Would you like your apple pies now?
Mum : (Very excitedly) Oh! What have I won?

She heard "Would you like your raffle prize now?" It took a few minutes to explain and calm her down.
The apple pie was delicious.

EDIT: And one from my non-b3tan friend

Mate of mine is at work and gets asked by an Irish fella "D'ya fancy a game of spankies mate?" Cue much embrassed apologies and answers in the negative. Only after the confused Irish bloke had left did he realise he must have been asking "D'ya know where the nearest bank is mate?"
(Butterdog, Mon 10 Jan 2005, 21:35, Reply)