Q:      How many members of the U.S.S. Enterprise does it take to change a
        light bulb?
A:      Seven.  Scotty has to report to Captain Kirk that the light bulb in
        the Engineering Section is getting dim, at which point Kirk will send
        Bones to pronounce the bulb dead (although he'll immediately claim
        that he's a doctor, not an electrician).  Scotty, after checking
        around, realizes that they have no more new light bulbs, and complains
        that he "canna" see in the dark.  Kirk will make an emergency stop at
        the next uncharted planet, Alpha Regula IV, to procure a light bulb
        from the natives, who, are friendly, but seem to be hiding something.
        Kirk, Spock, Bones, Yeoman Rand and two red shirt security officers
        beam down to the planet, where the two security officers are promply
        killed by the natives, and the rest of the landing party is captured.
        As something begins to develop between the Captain and Yeoman Rand,
        Scotty, back in orbit, is attacked by a Klingon destroyer and must
        warp out of orbit.  Although badly outgunned, he cripples the Klingon
        and races back to the planet in order to rescue Kirk et. al. who have
        just saved the natives' from an awful fate and, as a reward, been
        given all light bulbs they can carry.  The new bulb is then inserted
        and the Enterprise continues on its five year mission.