The day where the living triangles destroy your home if there is an instance of 3 in there. (or just the 8th day of the week)
OH FUCK, THERE IS A 3 IN HERE AND IT'S FUCKING TRIDAY.
Generally used to poke fun at people who did completely idiotic things leading to their deaths
Thank god that grandma who brought a whole shopping cart onto the escalator was removed from the Gene Pool.