Every once in a while you'll be happily playing through a game - doing normal stuff, like lighting bonfires or shouting at dragons - and something will appear that permanently lodges itself in the back of your cerebral cortex. Some video games enemies are so messed up that your brain registers your horror towards them by logging them helpfully in your head, for you to remember every once in a while just before you go to sleep.
And this is something that isn't uniquely limited to horror enemies. We were all traumatised by Dead Hand while playing through the Legend of Zelda in our youth, or given permanent fears of the water by Banjo-Kazooie's Clanker or Super Mario 64's eels.
Interestingly enough, sometimes this can have the weirdest results, like making you scared of mushrooms, or looking at a camera and bursting into tears. Whether you develop an irrational fear or not, though, you'll always remember these particular baddies - for better or for worse.
Remember: there's no shame in being petrified of the Clock Tower at Disneyland, so long as it's because a game told you to.