Have you bought a game again that you forgot you already own?

This could be a problem for those that bought too many games but don't have time to play them.

I almost did. Not because I forgot though: I had bought this awesome PS3 game (Supersonic Acrobatic Rocket Powered Battle Cars) and loved it so much that I wanted to buy it for my friend, too so we could also play it on his PS3 when I was visiting him. I didn't know that you can legally share the games you buy on PSN with friends!

Accidentally never.

On purpose few times but it was always buying super cheap steam version of something I already had because either

a) i wanted it on pc without need to look for disc

b) it was part of bigger bundle

Nope, I know my games.

Never. Even though I do have a lot of games, I know each one.

Accidently never, but I have done so many times in the past due to wanting it on multiple platforms.

no 

but i have bought an game again, because when ever you trade in an game, you want to play it again instead of all the games you still have. 

Never by accident, but I've bought revision of existing game such as planescape torment (I own 3 copies currently) and Heroes of Might and Magic 3

yes, weird story..well I almost get it a third time...all on the same day

it was PES3.

How's that even possible? I don't see how someone "accidentally" buys a game twice.

Anyway, I did buy games more than once, but never by accident.