It's like these birds know exactly how evil they are, and are really excited for you to find out how evil they are, and also know that because they're just owls, there's nothing you can ever do about it. This is like watching the most f****d up cuckoo clock ever.
Just another great example of why the GIF is one of my favorite content formats. I bet the entire, long-format video of these owls isn't actually that creepy (or maybe 3 seconds is all the cameraperson could capture before these owls telekinetically exploded his head), but reduced to a perfectly-choreographed, looped GIF, what would otherwise be a random few seconds of weird synchronization within a longer video becomes its very own piece of content.
What once had to be considered within a larger context now is it's own context, with an entirely separate meaning. This is even more true for animated GIFs culled from popular, familiar entertainment properties.