Staple follow up

So as I have talked to people about my staples, I have begun to wonder a couple of things. How exactly do they hold my skin together, and if they bend under on the bottom, how exactly are they going to take them out without ripping out my scalp. Wiki was helpful, but for a diagram that just explained it beautifully, I recommend this site. Warning, there is a video of a guy taking out staples with wire cutters and tweezers at the bottom.