Marge: Homer, Isn't It About Time For The... You Know?

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Marge: Homer, isn't it about time for the... you know?
Homer: Yeah, yeah, I'll go feed it.
[goes to the fridge, where he picks up a bucket of fish heads]
[singing] Fish heads, fish heads, doo doo doo doo doo...
-- Nothing suspicious there, "Treehouse of Horror VII"