Question: How many Betazoid counselors does it take to change a lightbulb?
Answer: One, but the lightbulb must want to change.
Question: How many good old country doctors does it take to change a lightbulb?
Answer: Dammit, Jim, I'm a doctor, not an engineer!
Question: How many Q does it take to change a lightbulb?
Answer: One. He holds it up and changes the rotational constant of the universe.
Kirk: Bones, go work on the engines!
McCoy: Dammit, Jim, I'm a doctor, not an engineer!
Kirk: Bones, take over at the helm!
McCoy: Dammit, Jim, I'm a doctor, not a pilot!
Kirk: Bones, go help those injured people!
McCoy: Dammit, Jim, I'm a doctor, not a -- never mind, I'll get right on it.