Evil laughter after you have told your arch-nemesis your evil scheme to take over the world. As seen in many cartoons, movies and videogames.
Lexx Luther to Superman "Now that I have you trapped by my kryptonie field.. I will tell you. I plan on using gigantic moths.. Yes! Gigantic moths to take over the world! Bwahaha!" Superman then somehow manages to get free and beat the crap out of Lexx Luther and foil his mothy plans.