Oh yeesh. "Well, it gets the milk from Mommy's body into a bottle, if I ever needed to do that." Whew. That seems vague enough.
"I want to see it work. I want to pump stuff. Show me how it works, Mama."
Hmmmm. Maybe too vague. "Um. No."
"Well, then I'll do it on myself!" (in a defiant "I'm-mad-at-you-for-not-doing-what-I-want" sort of way) Then, after a bit of shirt lifting (his, not mine) and some poking, "That tickles."
These kids crack my can.