Frank & Pete are sitting at the bar discussing the events of the day.  Seems Joe had been doing someone else's wife when the husband came home, burst into the bedroom & shot them both dead.

Finally Pete says "It could have been worst."

Frank slams down his mug in disbelief.  "Could have been worse?  Joe's dead!  How could it have been any worse?!"

Pete replies "If it had been the night before, it would have been me!"

author unknown
(I know oldie but goodie)