In the unlikely event you win two givaways of the same game, what should you do?

give it to me!

I mean ask for a re-roll

You activate one, mark this one received.

Then you contact the creator of the other giveaway and ask them to re-roll (request a new winner).

post that you want to reroll that giveaway in its thread, and leave that win feedback unmarked.

it should be obvious, but don't use that second key/gift. -.-

I recently won 2 GA of the same game ended within 2 minutes difference... I asked for reroll and it was done fairly quickly