Blonde: We need help. We're three blondes changing a light bulb.

Operator: Hmmmmm. You put in a fresh bulb?

Blonde: Yes.

Operator: The power in the house in on?

Blonde: Of course.

Operator: And the switch is on?

Blonde: Yes, yes.

Operator: And the bulb still won't light up?

Blonde: No, it's working fine.

Operator: Then what's the problem?

Blonde: We got dizzy spinning the ladder around and we all fell and hurt ourselves.