YOU'RE MOM.
A crying saucer.
cried Baby Bear.
Someone's mom is Snooki.
They both spit.
Brothel sprouts.
Me, to a baby wearing a Metallica shirt at the grocery store.
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)