If 你 could go back in time and change one thing, what would that be?

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I really want to say something like "you're birth." But Im not that mean xD

Probably buying the game 'Destiny'.

one time when i was driving a sedan i hit a deer. Now i would like to go back to that 日 before i hit the deer, stop myself from ever driving that car, and give me an 18 wheeler semi instead to make sure the deer is completely eviscerated. im against overpopulation.