Typical conversations around here.

V: I have a band-aid. My leg hurts. The Doctor hurt me.
Me: Uh Huh
V: Why?
Me: Because they had to give you a shot to keep you healthy (flu shot)
V: Why?
Me: Because sometimes that's part of growing up.
V: Why? But I was so excited.
Me: Why?
V: To go to the doctor!
5 minutes later...
V: I ate my cookie. Can I have another one?
Me: No.
V: Please?
Me: No.
V: PLEASE!
Me: No.
V: Puh-LEASE!
Me: No.
V: But my leg hurts!