Here's a short list of things that even though I always knew I would have children, and more specifically that I'd have boys, I honest to God never thought I'd say, much less repeat several times a day.
"Get your hands out of your butt!"
"Why would you lick that?"
"Do not TRY to fart!"
"Quit slapping your penis!"
"Bath water is not for drinking."
"I don't want to smell your underwear."
"Where are your pants?"
"That will make you sick." *random mouthing* "Yes, it will!" *random mouthing* "Fine, eat it, don't come crying to me when you're sick."