This is a whole different kind of Parent Trap (though, if Lindsay Lohan is still looking for work, we wouldn't mind seeing this viral video adapted into a feature film. She can be an extra or something).
This little baby met her dad's twin for the first time and it blew her mind. Understandably so. Because twins are as insanely weird and confusing to babies as seeing a clone would be to a fully grown adult. But the reaction is cuter when it's a little baby.
(If you watch the video at the source, start watching 6 seconds in and stop at the 1:46 mark. For some reason this video is only available with this random dude's commentary—he says he "had the video first because I asked for it before it was ‘cool'"—which is just as annoying as when you are looking for a specific clip on YouTube and click the thumbnail, only to discover it's a reaction video. The worst. And we don't need people emceeing viral videos. So stop that.)