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

Better question is "how much will you TAKE for it?" I get the heebies when someone asks me to make an offer on a part Im looking at. I was looking at a 2bbl pro-jection at the Fling and the dude asks make me an offer..I say "a hundred bucks?", he juts out his hand anxiously and says "Sold!" I said, " wait up, I dont want to buy it, I was just making an offer" He gets a little squishy and says "do you want it or not?" I said "no, its missing the $80 buck fuel pump" Seems I put both of us in an uncomfortable position....
I went to buy a beaqtger truck for transportation and hauling and I looked at a pre-runner style Ford ranger...bead lock rims, huge tires, racing buckets, no interior, AL dash 6" lift...I said, "I dont think so bro, I would rather you sell it to someone who would appreciate it more than me....." plus the fact that the odometer read 64000 miles and the pedals were worn through the pads and the motor was REALLY old looking...I think it had 264000 miles on it and I told him that too.