Wolverine

Me: I have to get an MRI on my foot today, x-rays harm the baby.

Brother 1: I hope your baby isn't like Wolverine.

Me: It hasn't clawed its way out of my uterus yet. I'm pretty sure it's just a normal baby.

Brother 1: The claws could still be developing. I'm more worried about the metal skeleton. When you go in for that MRI, the magnets will rip it right out of you.