Changing a Light Bulb

"Ouch! Sarah? Can you come in here?"

"What's the matter, Henry?"

"I'm trying to change this light bulb," Henry explained, "but every time I try to unscrew it, it burns my hands."

"That's strange, maybe I can—Ow! Did you try waiting for it to cool down?"

"I've been waiting for a couple hours now. It's still hot!"

"Let's get Bill in here. He'll know what to do."

"Are you serious?" Bill asked once he had arrived.

Henry and Sarah nodded.

"The light bulb is ON! Why do you even need to change it?!"

"Oooooooooh!" Henry and Sarah said in unison.