Yes happens oftens, there are two reasons why, guests dont know how large the pipes are in the house so they can miscalculate how much tp they flush with the turd, the other reason is metaphysical, the feng shui of a household cant tolerate foreign waste and so by having a stranger dump in you bathroom it creates and energy blockage which is not natural, embarresment is the cure once the embarrsment is exposed the blockage is realesed