VIDEOS:
"Have your fill."
After capturing them, Archnemon prepares to devour Gammamon's brain first, only for him to suddenly evolve into GulusGammamon and swiftly kill her. Namely by jamming his fist down her throat and firing off a point-blank Desdemona, effectively burning her from the inside out. Granted, after eating the brains of at least two humans, she deserved it, but Jesus...
Example of:
Villainous Rescue