Driving your car into an intersection
even though there are thirty-five cars with brake lights on in front of you
and there's no way you'll be clear of the intersection by the time the light changes. A good way to perpetuate
a traffic jam
Also the mark of a true asshole. You see, you can argue that when you're speeding, cutting people off, failing to signal, and driving to endanger, you're at least getting something out of the deal. But when you block the box, you're still just sitting there in the intersection like a dipshit, not going anywhere, allowing people in all four directions to take a look at exactly who the dickhead in the middle is.
Don't Block the Box!