Well, turns out one is not enough, but if you pair it, two can.
CHANGE!
None. Somebody else does the screwing for 'em.
Change!
Just one, but he'd have to watch Radiohead do it first.
Jeffrey Dahmer!
Marry her.
Because one nun follows the other nun to make sure that nun doesn't get none.
Using a pair of Caesars.
One to screw in the lightbulb, stock four carts of supplies, and handle seventeen simultaneous customers at any one time for five consecutive hours.