Me, teacher. You, student

This happened last night. Cracked me up!

Me - What are you reading, sweetie?
Sara- It's an ABC book. Mummy, what letter is this?
Me - That's an A. See? This is big A and this is small a.
Sara- And what picture is this?
Me - That looks like a yummy and juicy red apple! A for apple.
Sara- Good job, mummy! You're such a clever girl! (as she pats my back). And now, it's time for a joke!
Me - A joke?
Sara- Why did the banana go see a doctor?
Me - Because he's all yellow?
Sara- No! Because he's sick! (breaks into peals of laughter)

So now I know for sure that my daughter will make a good teacher but should never be a stand-up comedienne.