I had a guy one time get so pissy at me because I bought two each of the NECA Turtles Bebop and Rocksteady gang sets, and sold him the spare parts. I bought them to have both versions: one to have as their human form, the other as their mutant forms.
At this point, I had no reason to keep all the spare parts for anything, other than space wasters so I listed them and specifically stated that it was done so for customizers or anyone wanting just the parts.
Dude buys them up, I ship them out, three days later, dude is losing his mind on me. Calls me a scammer, cussing me out, asking me why he would buy just spare parts, etc.
I explain to him that I couldn't possibly rationalize his thinking on the matter, and that the listing for it very explicitly states everything that was included, and what all was in the set.
His excuse was that because I posted the pictures still in their boxes (even though the pictures also very clearly showed the empty spots in the trays) that it gave the illusion that everything was included.
I said "But the description clearly states what all was included, to the minute accessory". Being the absolute moron that he was, he wasn't getting it. He told me "I have your address, dude".
It was at this point that I said "Now, you're threatening me over your lack of reading comprehension?" and got eBay involved.
He tried to claim that he meant he had my address and he was just going to ship the stuff back and get his money returned, but eBay wasn't buying it and they blocked him from being able to make any returns or start any cases against me and he got a strike against his account in their system.
He listed the set a week later for more than I sold to him. The dumb fuck.