(The child your wife gave birth to is revealed to be a monster. And after a few weeks after his birth, he kills his own mother. That's how you remember it. You locked him up in the basement for about 4 years, and the child has grown resentful of you.)

You hear some noises coming from the basement. It's obviously the kid making those noises, as well as... Meowing? So you head down to the basement to see the child, playing with a stray kitten.