Q: How many Klingons does it take to change a lightbulb?
A: TWO: One to screw it in, and one to stab the other in the back and
take all of the credit.

Q: How many Klingons does it take to change a lightbulb?
A: NONE: Klingons aren't afraid of the dark.

Q: What do the Klingons do with the dead bulb?
A: Execute it for failure.