Be warned, possible HIMYM spoilers ahead! It's no secret that everyone is talking about the How I Met Your Mother series finale. But we're betting that you didn't now that the much-anticipated ending was actually shot almost a decade ago?

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The actors who played Ted's kids Penny and Luke revealed on Twitter that the scene for the finale was shot way back in 2005, around the same time the series premiered. This means the duo kept the secret for almost NINE YEARS!

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You have to admit, that's pretty mind-blowing. So what did you think of the HIMYM finale?