When you bring your baby home from the hospital after he’s born, your mind is reeling with the possibilities of parenthood. Mostly, you see rainbows, imagining afternoons at the park playing baseball and making macaroni necklaces for Christmas presents. What you can’t imagine is that at some point during your tenure as a parent, you’re going to have to say the phrase, “son, don’t lick your sister’s feet.”

You’re not an idiot. You know there will be ups and downs. There will be tantrums in the Fun Depot. Smoothies spilled in the car. Maybe some light biting. But having to tell one child not to lick the other child’s feet never even crosses your mind.

But it’s going to happen. The first foot-licking incident will be accidental. They’ll be wrestling barefoot and an errant foot will cross in front of someone’s face and that kid will seize the opportunity and stick his/her tongue out and take a lick. It’s an act of curiosity mainly. The other child will giggle and then it’ll be an all out foot lick fest, at which time you’ll have to say, “son, don’t lick your sister’s feet.”

It’s such a weird thing to say, you’ll actually pause and think, “I can’t believe I just had to say that.”

Soon you’ll be saying it so often, you’ll have to write it on the dry erase “rule board” next to other gems like, “don’t put mom’s pearls on the kitty,” and “don’t tell strangers their hair looks funny,” or “glow sticks are not food” or any number of bizarre societal norms that most of us take for granted.

But the foot-licking thing will be the weirdest. At least for a while. Then the kids will come up with something even weirder that makes you long for the simplicity of the foot-licking days. I don’t know what that thing will be yet. I’m just warning you, it’s going to get weird. Then it’s going to get weirder.