A childhood belief about farting

When I was young my mum told me that things that smell bad were poisonous. So every bathtime I would take an empty jamjar. I fill the jamjar with water and catch the bubbles from farts I did in the bath. Later on when my sister was a sleep i would sneak into her room and take the lid off the jar and let her breath the poisonous fumes in her sleep. To my disapointment se survived for over a week and is still alive