What's the WORST car/truck you've owned?

2002 Mercury Moutaineer. That trans is a timebomb waiting to happen. This is documented time after time on the web. For some reason it is a "sealed" auto with no dipstick? This is the only car I felt bad for the next owners because I knew it was only a matter of time before another trans would be needed even though it seemed fine when I sold it. We at least sold it cheap.