This Is Going To Hurt

I don't know how many times I have seen someone in a movie say "this is going to hurt" before they do something that most definitely will hurt, as long as it doesn't kill them instantly.

I have never in my life said, or even thought that, before taking action. Sure, I probably thought it once when I was falling out of a tree or something, but I had already completed the initial action. I did not, while sitting on my perch atop the tree, say to myself, "this is going to hurt," and proceed to jump.

When normal people say "this is going to hurt" they almost always follow it with "so there is no way in hell I am going to do it."