Ascaris worms are a type of large, parasitic roundworm that make their home in the human digestive tract. They are endemic in many parts of the world. I used to work at a hospital where we took a lot of patients from very poor and remote places, especially Central America, where roundworm infection is very common. When you put those patients under for surgery, the anesthesia causes their blood to become slightly alkaline, which the worms *hate*. So after a few minutes they will start coming out of *every orifice in the body*. Nose, mouth, r****m. And I'm talking full-sized worms that look just like earthworms. It is no cap one of the grossest things you can imagine.
You give those patients a d**g called Bendazole, they poop dead worms for three days, and then they're fine.