43. Medusa HeadsGAME: Castlevania (NES, 1986)
Their wavy pattern still gives us nightmares. As soon as they started appearing on the screen, we knew either two things would happen. One: we would jump, get hit by them, and fall into the nearest hole. Or two: we would jump, get hit by them, and throw our controller right through the TV screen. More often than not, we picked the latter.