Q:How long does a nurse take to change a lightbulb?
A: It takes just 30 seconds to change the lightbulb but 45 minutes to document it.;
Q: how long does it take a house officer to change a lightbulb?
A: it depends how long it takes him to find a nurse.
Q: How many senior consultants does it take to screw in a lightbulb?
A: Just one, he holds up the bulb and waits for the world to revolve around him.