Always go to other people's funerals; otherwise they won't go to yours.

This first appeared in print, without attribution, no later than January 1911 in Punch as: Visitor: "I've just come from the doctor's funeral, but I didn't see any of you there." Hostess: "No—my husband didn't care to go, as funerals always upset him." Visitor: Oh, well, if you never go to other people's funerals, I don't see how you can expect them to come to your's!"