Your first car.
1963 VW Bus
Bought it for $500 bucks. I didn't know anything about cars and drove it with some stupid red light flickering on the dash. Was sitting at a light and some guy tells me I'd better put some oil in based off what he could hear. Being a genius teenager, I gave him the F** You and romped on all 50 hp. Made it about 2 feet and blew a rod out of the block without a drop of oil coming out. The guy I bought it from felt sorry for me and gave me my money back. Wish I'd kept it, sadly probably worth more than my Dart is today.