This is a pretty effective one, and yet another way to abuse the Bad Sport system: If you see someone in a tank, immediately get your personal vehicle and ram into them full speed, detonating and giving them a Bad Sport warning and insurance cost. Repeat this process at least five times, trying to ensure that the person receives their dunce cap.
I'm open to suggestions on how it can be improved. Obviously the point is to educate players who would like to grief more effectively. Griefing is a perfectly legitimate strategy online.
And what if the tank is their personal vehicle?