When I was 18 and leaving for basic training, I lent almost all of my PS1 RPGs to one of my oldest friends and his sister (who were both big RPG fans). I said that I couldn't use them while I was away, and I didn't want to leave them with my younger siblings.
Several months later, when I come back after basic and tech school, I ask for all my games back. "Oh, I thought you gave them to us." Uh, no. Why would I do that. Please give them back. "Well, uh, they've been in a box somewhere in our dad's garage ever since he moved." Their dad lived a couple hours away and none of us had a car - I was only visiting, too young to rent a car, and my friend only had a bike because he was in college.
I wondered if he was lying to me, so I looked all over his room after he went to his next class. Nothing.
A few year later, when I was stationed overseas, I took some leave to visit my friends back in the US. While visiting the same friend's house, I was showing them Metroid Prime, but I accidentally left the game in their GameCube when I left. Several months later I was given a new assignment at a base only about an hour from his house, so on my next visit, I asked for the game back. "Oh, I sold it." Christ, what an asshole.
Selling my game wasn't just a dick move, it didn't even make sense: this was in 2006, and a used copy of Metroid Prime cost about $4.50 at GameStop - meaning he sold it for under a buck. What the fuck?