Not for Me
You can tell the story’s going to be good when the OP starts with, “My personal favorite was…” The OP got an almost-brand-new Fender Stratocaster when the rich kid down the hall decided he didn’t want to be a rockstar. The best part was that he sold it to the OP for a measly $20.
For reference, a brand-new Stratocaster can cost upwards of $700, meaning that in the eyes of the rich dormmate, his guitar depreciated in value by nearly 98% in one day. And the guitar still works 15 years later. The best stories are when you can score free or nearly free stuff from rich kids!