A computer mouse.
or
Actually, agents will screw in just about anything.
or
When the big hand touches the little hand
or
Two, one to screw it in, and another to repent.
or
One is really heavy, the other is a little lighter.
or
But I don't want to be naked in an exam I haven't revised for.
or
Nothing. Nuts can't talk.
or
But that's just nuts
or
Bozo The Clown has real hair on his head.
or