Animals are weird. Plain and simple. People are animals and I think most people are pretty weird. But this is the weirdest of the weird. Have you ever heard of a flatworm? Flatworms, also called platyhelminth, are a group of soft-bodied, usually much flattened invertebrate that live in any moist area such as oceans and lakes. And believe it or not all of them have both male and female reproduction organs. Pretty weird so far but it gets better.

So, say these flatworms want to make some baby flatworms how do you determine who's pitching and who's catching? I'm sure this problem is not just exclusive to the flatworms, but here's how they decide who's going to wear the pants that night.

Penis Fencing.

That is not a joke. That's what they actually call this ritual. The two flatworms rise up and fence each other with their penises. And it only gets worse when you consider that they each have two penises, or a double barreled insimenator, as the narrator calls it. Check out the video below and be thankful that you don't have to fight about who is entering who tonight.