Mine came from my old work mates, I had a rather embarrasing dream about our boss

, which I made the mistake in telling my friends. When he turned up at the office, they told him they new some who dreamt about him and rather than saying my name Louise, they said it sounds like Pooise, not hard to guess from that really!!
Sounds quite silly but actually stuck for years and still get called Pooise at the age of 30!!