Lucy: "Hey Mom, why do you have hair in your pits?"
Me: "Well, remember when you get older how you'll grow breasts? You'll grow hair in your pits at the same time."
Lucy (now totally redirected to breasts): "Your breasts are big!"
Me: "Uh huh."
Lucy (looking down her shirt): "But Mom! Mine are only as big as chocolate chips! They'll never grow bigger!" (breaks down into tears)
Me (trying not to laugh): "Oh, don't worry honey, they will ..."
The chocolate chips part cracked me up.