Billie: “Moooommmm. I can’t go to the bathroom. It’s dark in there.”
Me: “You have a flashlight to get you to the bathroom and then you can turn on the light once you get there.”
Billie: “BUT WHAT IF A ZOMBIE ATTACKS ME?”
Me: “Then I will grow wings and fly to you, bite off the zombie’s head with my bare teeth, and fly on a unicorn back to bed. Where I belong. Because I’m sleeping.”
Billie: “But- but unicorns don’t exist?”
Me: “NIETHER DO ZOMBIES.”
Billie: “BUT I’M SCARED AND I WILL LITERALLY PEE ON YOU.”

Parenting: Wherein you can solve the problem, be totally right, have completely sound logic, and still 100% lose the battle.