So she didn't whistle on the way down.
The way that the punchline of the joke is delivered.
How do you put an elephant in a safeway bag? : I don't know, how? : Take the S away from "safe" and the F out of "way." : But there's no F in way. :
It'd be a waste of time.
He wanted to go bear foot.
So they don't whistle on the way down.
To prevent them from whistling.