I've almost taken the liberty of disconnecting someone's front wheel before... I really feel that I should. They leave it u-locked to a rack by that wheel, and it's a quick disconnect... I could have their bike sans the front wheel in five seconds. So I thought about subtly disconnecting it and such, so when they pulled the bike out, the front wheel would be left sitting there.

But that wouldn't be the same... I'd take it out of the fork and just leave it close.