I believe it was Tales of Destiny. Spoilers ahead, but its very old game so you had your chance to play it. Someone stole a crystal so you had to retrieve it because otherwise earth would be destroyed ( or something like that). I defeated the bad guy, got the crystal back, got my thanks from the king, went back to my home, went to bed, closed my eyes, screen went black. I thought thats it, here comes the ending credits. Instead I got a message "Wake Up! Crystal has been stolen again!". MTHRFCKRWTFISTHIS!? That was the shittest way to make the game longer.