On a boat...
Captain (boasting): This boat makes twenty knots an hour!
Passenger: How long does it take the crew to untie them?
If the human population held hands around the equator...
A significant portion of them would drown.
How do you know how fast a baby cow is running?
You measure its vealocity.
It's so cold here...
That the local flasher is running up to people describing himself!