A polite bulb.
You ask them to hold the door for you.
A low-key person
One, but the lightbulb has to WANT to change.
One to put in the new one, and two to sing about how good the old one was.
My son's 10 years... hold on... OFF THE COUCH! brb... convulsing.
Hold up your arm and say "Go back you didn't say 'May I'"