The answer is "yes", but not through parasite worms. Mostly through bringing live animals into the house and letting them loose so you can encounter them whilst sitting on the commode.
That, or they wake you up every two hours during the night wanting in and out, every single night of your life. You would ignore them if you could, but it's impossible. You would leave the pet door open for them, but they'd just bring in live animals and let them loose so you can encounter them whilst sitting on the commode.