Crossword puzzle clue "it's formed in your head"

Head coverings (like, you put them on your head)

All-in-one breakfast foods popularized by a song from "Adventure Time" (having it instantly get stuck in your head will be your punishment for cheating and Googling it)

Dance move where you duck your head and stick out your arm

They're gonna do what they do so just turn your head away and hold your palm out

"You had best unfuck yourself ___ will unscrew your head and shit down your neck!" (Sergeant Hartman from "Full Metal Jacket")

If they're dropping by your house, don't stick your head out the window