I don't know how many widows the aircraft created, but The Royal Aircraft Factory BE.9 Pulpit fighter must have been a piece of work. It was a two place aircraft with a pilot and an observer/gunner. This unlucky individual sat in a pulpit
ahead of the propeller and operated the forward firing machine gun. On landing, in the case of a nose-over the propeller would have sliced the poor man into little gunner/observer cutlets.
Not to be outdone, the French manufactured their own copy of this abortion, the
Spad A2.