Replies from science types and Mr. and Ms. Wizard's appreciated. Why did this lightbulb light up? See below:
The switch was a spin type. I spun it and spun it and couldn't figure out why the cast iron lamp wouldn't light. Finally, the bulb lit...weakly.....and went out. Frustrated, I went to check the cord. The lamp wasn't plugged in at all! The bulb shouldn't have lit at all! Why did the bulb light?