Sneezing. I sneeze too loud for it to be involuntary apparently
Not in Canada, but scary as hell:
When i grew up we had 2 geese, a male and a female. One morning we woke up to find the male had hung himself in a gooseberry bush (god i never even thought about the name of said bush in English before). Having a suicidal goose is pretty scary in and of itself but as a result of this the female goose got some sort of ptsd and would attack anyone within a 50 meter radius which, conveniently, meant our whole back yard. Wonder where that goose went because i obviously left the house at some point.