There's a fangame called Sonic.EXE, and while I've only seen playthroughs of the game itself, I took a risk and played the much tamer version on SSEGA called Ordinary Sonic, where if you don't blaze through the stage fast enough, the level will become what I call "Death Zone", and if you're rather unlucky, Sonic.EXE will come flying in(on his belly, legs behhind him, arms out) and kill you if you don't hit a power-up box in time. The power-up boxes in "Death Zone" become boxes with static screens that return the stage to normal, and "death by Sonic.EXE" is prolonged. Anyways, I played, got a game over in Green Hill Zone "Death Zone" Stage 2, and when I went to go back to the main screen to play again, I freaked out and closed the SSEGA tab when I saw the closeup of Sonic.EXE's face as seen at the end of Sonic.EXE(fangame). I mean, being chased and begging for a power-up box is heart-attack indusing enough, but seeing that face scared the living daylights outta me! That's going to haunt my dreams for years to come!