i have so many favorites:
"well, this guy over there has it for $50 cheaper!" oh wow, that's a really good deal. you should go buy it.
Had a guy do that on a part, told my friend to go see if he could find it and buy it, smoking deal. I sort of knew who had it and pointed the right direction. Mine was nicer and worth more than what I was asking, so was the other one. He found it, bought it, brought it back and put it in the truck.
Dude walks off after being a d... (you're overpriced, blah blah blah) I'll get the other one. Sure you will. He comes back looking for the one I had for sale, another guy I knew was holding it. Supply/demand in action. If you did enough selling at these swaps, you hear it all.
On a really bad day, end of day, had an A body 8.75, wanted 450 for it, didn't want to take it home. Guy does the well guy down there has one for 400, was really priced 500, so he's playing both of us. He walks up and says the 400 number, I look at him and yell to the other 8.75 guy... I'm firm at 550.... yeah I'd had enough that day. He walks to the other dude and seller yells at him "**** off liar".
Biggest thing, as always, treat people decent until they don't deserve it. First impression has no second chance. Bees with honey deal. If they are a wiener, roast them a bit.
It's part of the fun.
I can get it at the junkyard... time is money and this one is already off and cleaned up. Knock yourself out!