Now the scariest Mario Kart's game over screen has got to be Super Mario Kart's game over screen, I've played this when I was a kid, I ran out of retries, I got ranked out, the upper screen goes black, and I got a game over where the musics starts to creep me out, because of the screen goes black and the music of the game over screen scared me as a kid.
Now, Blazblue: Calamity Trigger's game over is creepy, you get the red screen with a symbol, it plays a music that was a little creepy while I got a game over. I play as Ragna the Bloodedge, I got stuck after I beat Jin because that robot beat the crap out of me. And I've seen it on YouTube, and when I played this game.