Doctor H.H. Holmes (also known as Herman Mudgett) is often referred to as, "America's First Serial Killer" and he honestly deserves the title. The child of wealthy parents, he reportedly started out his privileged life like many serial killers seem to start out... by torturing and killing animals. Pro tip: That's never a good sign in a child. If you ever come across a child that does this, run away and tell an adult because that kid is probably going to grow up and murder you. Nonetheless, he went on to receive a medical degree from the University of Michigan, where it's reported he made a habit of experimenting on stolen corpses. Standard grad school stuff, right? Right.