There was a sub teacher in my cooking class last year and he started to talk about how micro-waves heated the food in the microwave and before thinking i raised my hand and said "so what does the lightbulb do"
A childhood belief about technology

others believed things like this
- I used to think what heated the food in the pan was the boiling water, not the heat under it.— Mario
- I always believed as a child your stomach was a big hand which squeezed your food out through your bum....— amc
- I used to think my elementary school gym teacher's name was "Jim Class".— Brandon Campbell
- My teacher held out a hand to say, "stop" but I thought she wanted a high-five.Anon
- I believed they put heated coils in lakes for the ducks to swim in the wintertime.Anon
- I used to think that if you shone a flashlight beam onto a lightbulb long enough, it would eventually light.— Karen K