Hear the stories going viral this week from the SCMP People and Society desk with Luisa Tam and Kevin Kwong. The airbnb guests from hell who protest a denied cancellation by turning the taps and gas on for days; the man who had his girlfriend's name added to his mother's tombstone, only to have her demand it be removed two years later; the grieving brother and sister who find out their dead mother left them millions, made even more distraught by the brother's wife demanding her fair share, and…