My light bulb moment came when I realized it was better to refer to people as light bulbs instead of their IQ's. If 100 watts were the norm, many people think they are bright at 75, but many are sadly not too bright and are only registering at 60 Watts. That is much better than my son's favorite catagory "Oven Light".
If you want to get really carried away, you can refer to some as LED's since it takes a negative charge to get them to light up. Some are Incandescent since they are not capable of producing any brightnes until you pass electric current through them. Some are toxic like the mercury found in Fluorescent bulbs.
My, well unfortunately, I admit, my bulbs are burned out! :)