Because he was under cover.
or
Twenty. One to hold the bulb, two to turn the ladder, and 17 to be on the guest list.
or
First he lies on one side, then he lies on the other.
or
First they have to agree on which is better; the analog bulb or a digital bulb.
or
The cow that jumped over the moon
or
Bozo The Clown has real hair on his head.
or