Karen: I'm pregnant.
Hank: I'm not convinced.
Karen: This is happening. Fuck!
Hank: The rabbit done died, huh?
"The rabbit done died" are lyrics from the 1975
Aerosmith song "Sweet Emotion" on their
Toys in the Attic album. The lyrics are a reference to an early type of pregnancy test called the "rabbit test" that involved injecting a female rabbit with a woman's urine.