Because the stalks are all ears.
Holy moley, I didn't know that!
It smells funny. --As told to me by an Engineering lead... Much facepalm ensued.
Disclaimer: I don't know how well this joke will work in English. What's yellow and lies in a pond? An excevator. You don't think this is funny? Neither does the operator.
Dalek themselves clean
Cover your ears with your hands
When they even put their ear up to the bathroom keyhole.
Because Jack was bean stalked
Cus it was being stalked!
It didn't matter, they were all ears
It goes in one ear and out the other
