I was reading Elliot one of his library books (an Elephant & Piggie story), when I came across this picture.
I chuckled at Piggie getting an idea with a compact-fluorescent bulb. Then I realized there wasn't anything funny about it. That's what lightbulbs look like.
In fact, I'm not sure Elliot has ever seen an incandescent bulb in real life. When I asked him if the bulb in the story looked funny, he studied it for a while and said no.