Child: I’m bored. What should I draw.
Father: Draw a parasite.
Child: Yuck.
Father: Seriously. There are so many kinds. Draw what you think a parasite looks like.
Child: Okay. [Makes single dot on paper with tip of pen.] Now what should I draw?

When I was a kid and asked my father that question, he suggested one of three things: flies, a bucket of water, or a bath.

I don’t know how many buckets of water I drew as a kid.