Two at most.
A PENNEtentiary!
A philanthropist likes to impress people with his larg**esse**! :-P
She's only happy when "It's Complicated."
One. They simply hold the bulb and wait for the world to revolve around them.
A: Cocaine.
Seven - one to actually change the bulb and six to complain that they liked the old one better.
A Global Offensive.
Uranium gets to its half-life on time.