How did one of my socks end up under the wheel of a car five doors down my road?

Possible scenario 231: The sock fell out with its partner sock and went out into the street for sulking / 'making a point' purposes.

Possible scenario 452: A spider dragged it out of my room and into the street to perplex me, as revenge for me hoovering up his brother last week.

Possible scenario 628: Aliens abducted my sock. Then discovered it didn’t fit and discarded it.

Possible (and much more likely) scenario 874: My sock somehow fell into my bedroom bin. It was then parcelled up in the household rubbish, and placed out in the street on bin day. As per usual the binmen didn’t turn up, and seagulls tore the bag open looking for lunch. They found my sock and trailed it down the street, dumping it once they had deemed it unfit for consumption or nest-lining purposes.

The truth is out there. The sock is going in a hot wash.