Right up there with moving house and getting married has got to be losing your mobile.
The annoyance of losing all the numbers from the sim coz you didn't have a system to store them in the computer is just so, so ... well it's REALLY annoying.
Especially when the only number for a girl you just met and want to have a lot more to do with is on there and you have to track her down through her work and ask them to call her to call you.

arrgh the pain