Our brains trick us all the time. But that's not a bad thing. It's great at filling in gaps when our eyes or ears miss a beat, to the point where it'll make stuff up that isn't there. This AsapSCIENCE video shows just how good our minds are at doing this. Creepy good.
As the clip explains, the brain will happily use other senses to try and make sense of the world when say, someone coughs in the middle of a sentence so you miss a syllable or two, or implanting vocals into a purely instrumental version of a song you've heard a thousand times.
If you want your dose of eerie for the day, just listen to the "speaking piano" from the 0:38-mark. When you hear it alone, it sounds like, well, a piano.
But as soon as you can see what it's supposed to be saying — the Proclamation of the European Environmental Criminal Court — prepare for your mind to be blown.
Now I'm trying to decide what's more terrifying: the piano or Smash Mouth. It's a toss up, really.