(Melody: Grandfather, I think this belongs to you.) NOOOOOOOOOO! (Triton: Never again will you or yours threaten my family! There will be no escape for you... Ever!)
Source: The Little Mermaid II: Return to the Sea
Note: Melody threw the trident to Triton, which in turn allowed him to freeze Morgana inside a block of ice, causing her to sink into the abyss below. It can also be noted that while she is sinking, she manages to mutter the word "Mommy" as she sinks to her death.