I don't know the proper "-philia" words for some of these, but they exist.
People who get off on shitting/pissing themselves.
People who want to have parts of their body cut off and turned into clothing, which is then worn by themselves or another person.
Coprophilia/scat: Everyone knows what this is.
Car crash fetish, which became well-known after the release of David Cronenberg's "Crash."
The one like in the film "Feed" where people feed each other or themselves to become as massive as possible.
Cutting off body parts and eating them, or having other people eat your body parts.
Gas mask fetish.
Sloshing: basically making yourself/each other as wet and messy as possible using food or liquids or anything like that.
Adult babies are just weird.
One time I found 3D CGI images of Japanese dinosaur porn.
Wikipedia has a lot of strange fetishes on there. Type in "paraphilia" to see the various types you can read about.