Car crash- purposefully crash the car, and BAM dead person. (Most likely)

Cat- Cats can be violent. Trust me. (Actually, maybe that's not a good idea. You're looking at a book about ways to kill someone. By me.)

Chainsaw- Remember Borrowing? Yeah, chainsaws...

Choke- We've all choked on food before, right? Just imagine that, but on a much more dangerous level. Like someone pinning you against a wall with their hands around your throat. Good luck kid.

Crush- Let's see here, boulders, large animals, got caught under an elevator...

Cut throat- Yeah... blood loss guys.