Changing Light Bulb

Three blondes are attempting to change a light bulb. One of them decides to call 911: 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.

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