'You Don't See Anything Funny About That Lightbulb?'

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.