he got a little behind in his work.
or
Because pepper makes them sneeze
or
None. They will never find a bulb that burns as brightly as the old one.
or
Because he was feeling crumby.
or
He presses the paws button.
or
......... one jar.
or
Because there's no one else to wag it for him.
or
Just one, provided there is a programmer around to explain how to do it.
or