It's time to go to sweep.
or
At the Whale-weigh station.
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One; after reflecting in the twilight on the merit of the previous bulb.
or
The dentist is taking me out tonight.
or
Because pepper makes them sneeze
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Three. One to climb the ladder while the second kicks the ladder out from under her. And the third to say, "I knew that was too high for you dear."
or
Billllyuns and billllyuns. Light bulbs are part of the interstellar "goo" that pervades our universe; they are star stuff.
or