There is a superstition that if a funeral or a memorial service (a Buddhist service) is done on a tomobiki day, a friend is drawn to the other world (= die), and in some areas crematories are closed on tomobiki days.
葬式・法事を行うと、友が冥土に引き寄せられる（＝死ぬ）との迷信があり、友引の日は火葬場を休業とする地域もある。