Because an undocumented worker has been living on his head for the past 2 decades!
or
Because E.T. eventually went home!
or
Two: One to screw you out of a fee, and the other to send you to a store where they ran out of bulbs weeks ago.
or
One; after reflecting in the twilight on the merit of the previous bulb.
or
feel really weird about donuts right now.
or