Knock Knock
There are plenty of reasons why you should never open the door if you hear knocking at night. Most people will think of the obvious ones, like a robber or some kind of bad guy, but you should also be wary of “alien-looking creatures” as well. They’re definitely not a good sign!
I wonder why the father denies ever seeing this thing. Perhaps it scared him so much that he decided to block it out from his memory. Or maybe he didn’t want to freak his kids out anymore and just lied to convince them it wasn’t real. Either way, it didn’t work!