You were a kid, a Sonic fan, who just played the typical Sonic game, but not realizing it was a bootleg.

Strangely, the game cut off suddenly, and you strangely hear a very demonic voice that laughs maliciously.

...it came from the TV. The screen cuts to black. After a few seconds the screen said "Act 3" with a black and white, Sonic-looking freaky creature with a skull-like face that stared at you. You don't know why this happened.