By Lyndsey Beatty | Gaming Insurrection

Monsters have always been in our thoughts and our video games, apparently. The concept of things going bump in the night didn't just appear with a classic such as Castlevania for the NES. No, monsters in games have been a concept for a minute, as far back as the Atari 2600 and the heyday of arcades.

And it's been a profitable concept, too. The horror genre - specifically survival horror genre - has always been deep in folks' pockets. Resident Evil, which is considered the progenitor of the genre, has sold 170 million units across eight main games and countless spinoffs.

However, other genres, such as light gun shooters and action horror, have seen success also. Silent Hill has shipped 11.7 million units over 25 years, and the House of the Dead has enjoyed 2 million in total sales for a variety of modern consoles.

The word horror invokes terror and thrills, and we're reminiscing about the games that give us the shakes and send shivers down our spines along with our favorite monsters that are the terrors of the night.