The vengeance of Hell boils in my heart,
Death and despair flame about me!
~Queen of the Night aria
Have you heard the Queen of the Night aria by Mozart? It's an unusual-sounding piece, which makes sense when you consider the words she's singing (and that she's trying to get her daughter to kill somebody).
My daughter was singing that aria to herself the other day; I don't know what made it come to her mind, but it's been in mine ever since. It made this list of Top 10 Opera Songs: