Afraid of the dark
I promise that potty training won't be a recurring topic here, but I have to share something funny. Our son is coming along very well (at last!) with toilet training, but he has one little problem. There's an octagonal window in our main bathroom. At night, it apparently looks big and dark and ominous to him. He's not especially afraid of the dark, but for some reason, that window bothers him at night.
The solution? "Daddy, can you turn out the bathroom light, because I'm afraid of the dark."
Worked like a charm. I guess it's all relative...