I once bought a custom van. Picked it up a few days later. Dealer gave me a voucher for a full tank of gas. I filled it up and started home. I kept looking at interior and it just did not look quite as I remembered it. Finally pulled off the highway and checked the VIN number versus the sales paperwork. They did not match. Turned around went back to dealer. They had another van, mine, with identical paint on outside and slightly different interior.
Needless to say they were very embarrassed. I got my van and another tank of gas and was on my way! As the expression goes ---- hppens!