Tailgaters on motorways seem to really get me recently. I'm on a motorway, sitting happily around 75 (only a 1.1, so not wanting to push it), in the very left lane. Some cretin in a Ford Galaxy (2 late twentyish looking guys driving) comes right up behind me, probably less than 2 foot off my bumper and just stays there.
Probably not a good idea, but I decided to mess with him a little, slowed the car down to 50, bare in mind the right lanes are pretty blocked meaning he can't move over. Forcing him to sit there, once he goes to overtake, I just carry on back up to normal speed, as it happens, he can't get past in time and has to pull back in behind me.
(Yes, I know, not a smart/clever thing to do, and I'll probably get flamed for it here, but he was just being annoying, and it was fun).