I remember a Little Lulu comic from my youth, it's Valentine's Day and Lulu receives a bunch of valentines from male admirers, all pretty much the same, except for an anonymous one which reads,

Your nose is red
Your toes are blue
You make me sick
To my stomach too.

She scours the neighborhood, attempting to find the culprit by pretending that she thought the card was hilarious. No one admits sending it.

That evening she baby-sits for a pre-schooler, and he, much too young to read, admits sending her the card because he liked the colors.