Am I Being Unreasonable? Original Owner Wants Car Back

I don't know? That backfired on me once. Back in the mid 80's, I had 2 or 3 Challenger parts cars sitting around and advertised them in Hemmings Motor News for sale. A dude from Ohio came to buy them, promtly paid me full asking price for all of them and asked if he could just take what parts he wanted from each and leave the remains. Sure, done deal. I had a 72 Challenger 340 that I had just bought for $700 behind my house that I planned to spruce up and drive. It was black on black, not rusty but had one banged up front fender that I already had a replacement for. The guy kept asking me to sell it, and I kept telling him I didn't want to sell it. This went on for several hours and I finally got tired of it and told him $4500 to shut him up. He shut up when he stopped counting out $100 bills!!! :BangHead: