A suggestion reguarding entering multiple competitions

Let's say I entered two competitions for Skyrim, each ending within an hour of each other. Then suddenly! I have a seizure and I'm rushed to the hospital. I return four hours later, and as it turned out I just ate some bad cheese. I rush to my computer to see if there are any good competitions happening. And I discover not one, but TWO E-Mails waiting for me. As it turns out, I won BOTH Skyrim games by a freak chance.

Since I know that entering a competition for a game you already own is against the rules, I would have to E-Mail back saying "I don't want it" or put it up for another giveaway.

I know this would just about NEVER happen, but you never know.

My solution is this: If you win a game, you are automatically withdrawn from competitions giving away that game until you claim your prize or something. This would prevent any freak-chance winning two of the same games.

What do you think?