Parents of Reddit: What would you do to the person that harmed your child? (if given the opportunity)

I was playing with my young son, and thinking about what I would do to a person that ever hurt my son. And wished if something terrible did happen, that I could have just 5 minutes alone with that person.

So tell me, what would you do if given the chance? If your kid was seriously hurt by someone? You get 5 minutes alone with them.