That's a funny story, Athiga! I think the same thing must have happened to me several times. I remember buying Fallout 1 and 2 for some ridiculous price (maybe $10 for both). The only game I lent was Temple of Elemental Evil, and of course the guy never returned it (though I still have the box).
My grandpa said it best--don't loan anything to anyone. Just give it to them as a gift or refuse.