it's usual to leave your bike chained to something random in london, usually without the front wheel. the idea being that bike thieves are too stupid to think about doing a wheely as they steal your bike.

here, someone has gone for the opposite approach. they've chained their front wheel but taken the rest of their bike with them. i like that approach.

it's a bit like those car radios you can take out so they don't get stolen. people with those should leave the radio in the street and take the car inside. primarily because cars are worth more than the radio.