One. No, two. No... How many do we have on the truck?
or
They both dribble.
or
Three - one to cast the bulb into the outer darkness, and two to catch it when it falls.
or
They screw millions of bulbs every day, but when it comes to your bulbs, there's no record.
or
Anything you like, he can't hear you.
or
"Let me see your birth certificate".
or