dumbest excuse someone gave you for not buying part/ car from you?

I often sell at swap meets. Last weekend I had a space at the Fremont Mopar Alley show. I had price tags on most everything. A few things I left unpriced. The minute we rolled in, we were swarmed by people looking to buy. I made the most money I have ever had this time. I priced stuff at or below the prices at the local Pick-n-pull junkyards even on stuff that is REALLY hard to find. I was only lowballed 3 or 4 time the whole day.
In the past I have seen guys at swap meets that hover over a part for several minutes, not sure of whether to buy or not...THAT is annoying. Once I was at a swap meet with a friend and we got separated. When I found him, he was standing a few feet from a guy that was looking at a Challenger rear valance panel. I asked my buddy..."Hey, isn't that the valance you wanted? Is that guy going to buy it"?
"I don't know... maybe he should make up his friggin mind!
The idiot did buy the valance after all. We found another a few rows down.