Hagerty has an article with the stories about the car that readers took to prom, here's my favorite:

Tom:

 I had a 1941 Series 61 Cadillac Sedan (in very good condition) that had been sitting up on blocks in a neighbor’s garage for 15 years. When my friends and I were young kids, the owner would allow us to play in the car as if we were driving it. As I approached my 16th birthday, the neighbor said that, if I got it in working order, I could have the car for $100. I was able to do so under the guidance of a local service station owner. 

When I received my license in 1967, I became “that guy” who all my friends wanted to double date with as it had a very roomy back seat.

https://www.hagerty.com/media/hagerty-community/according-to-you-what-vehicle-took-you-to-prom