So I've been selling unneeded stuff on CL, and I listed this video camera I never used that I got as a sign-up bonus when I opened an account somewhere.
After a couple of nibbles I got a real bite and this guy came over ready to try it out with his SD card and with cash to buy it. Well, he tried it out and the darn camera would not work with the SD card. At that point I figured something might be wrong with the camera (or maybe the card was messed up, though he said he just used it with his photo camera and it worked fine). I decided that the camera wouldn't be worth much without the SD capability since it didn't have much internal memory, and I let him take it without payment. I didn't feel like messing around with it anymore trying to figure out what was wrong. He said he would try to make it work, and if it did, he'd send me a check. Yeah, right, I thought. I'm never gonna see that money.
Same night I get a message from him asking for my address to send a check. He had gone by a camera store and they helped him (he just needed a smaller capacity SD card). I got the check in the mail 2 days later, deposited, it went through. Woohoo! $30 for something I didn't even buy. :) And what an HONEST guy! There are good people out there.