Bart: [bursting in] Mom! Dad!
Homer+Marge: Don't turn on the light! Don't turn on the light!
Bart: There's a UFO outside my window. Seriously!
[in Bart's room]
Marge: Oh, Bart, it's just an old golf umbrella stuck in a tree.
[it dislodges and swoops towards the window]
Bart: Aah! C-c-can I sleep in there with you guys tonight?
Bart: Can I sit on the roof with a baseball bat in case a UFO
Marge: Yes, yes, yes, that's fine. Good, good. [walks out]
-- Marge, always the concerned parent,
"Grampa vs. Sexual Inadequacy"