Here's a good one.
I was looking for a cheap and trashy GE Monitor Top fridge cabinet. Wanted it to use for testing cooling units which people bring for repair, without their cabinet. It didn't need to be "nice" just not completely falling apart.
I found a picture of a rusted and abused cabinet on Craigslist within an hour of home. The ad said "<span style="text-decoration: underline;">GE Monitor Top Refrigerator, rare and vintage! Needs Freon</span>." They had one picture of a cabinet with a homemade wood cover on top.
When I contacted the seller, she told me that a serviceman looked at it, and said it needed Freon but he couldn't figure out where to put the Freon in. I explained that while these didn't use Freon, the gas does go in the unit through the service port on the top next to the compressor.
After further talking, I realized that the entire top assembly (cooling unit) was missing. There was a cord connected only to the cabinet light circuit. She thought that was the only cord to the fridge. She would not budge off the $500 price and cussed me out, saying "All you people need to stop trying to rip me off! I'm a woman but that doesn't mean I don't know what I'm saying! I know what I've got, and it's $500 FIRM!!!!
All I could do is just sit there and shake my head slowly while the temporarily paralyzed brain cells started working again.