OH MY GOD.
Okay, one was called Little Ninja Brothers and for some weird goddam reason, the game scared the crap out of me. The bad guy looked menacing to my 6 year-old eyes, but that wasn't the bad part. When fighting little guys, there's a chance that they'll run away and a big *&^%ing minotaur will charge into the fray. His entrance is punctuated by a very dramatic change to the music that tells the player in no uncertain terms that you are not going to live. Indeed, every time the minotaur appeared, my brother and his friend (I, being the little brother, never got to play) promptly got squished. Anyway, that game scared me a lot.
There was another game. For the life of me, I simply cannot remember the details of this game, but I do remember encountering what appeared to be a young woman from behind. She turns around to reveal she's actually a skeleton! She reaches out with her sharp fingers, and.... game over. This game obviously didn't leave as much of an impression as Little Ninja Brothers, but I still hated my brother every time he said he wanted to rent it.