The inaugural You Don't Know Jack* award goes to everyone who blocked up the M25-A2 roundabout today by not understanding that, if all of you decide to drive onto the roundabout - even though you can see there's currently no way to leave - because otherwise the people already on it will be able to get ahead of you, then no-one, including yourself, can exit or enter it. Hopefully you're still stuck there and missed the ferry or whatever you were heading for.

Morans.

* Named after the "I'm Alright Jack" effect, which was explained to me thus: imagine you're seated at a concert and you stand up to get a better view. This will work untill everyone else stands up and your view becomes as bad as before but now you have to keep standing. Much of human stupidity is based on a lack of understanding of this.