If one makes a casserole dish of leftover mutton (a fancy name for sheep!), some vegetables, and gravy, and tops it with mashed potatoes, one has made Shepherd's Pie.
On the other hand, if one makes the same dish with leftover beef, one has made Cottage Pie.
But, if one makes the same dish with leftover turkey, what has one made?
First, we (the "one" thing was getting awkward) must decide whether the resulting dish should be named after an occupation or a dwelling. Which leads us (or one of us) to wonder why Cottage Pie is not called "Cattle Rancher's Pie"? Do people who live in cottages never eat sheep? Do shepherds never live in cottages?
Turkey Herder's Pie? Suburban Ranch House Pie? Poultryman's Pie? What is the correct title for someone who raises poultry? Do people who live in McMansions ever eat things like this? Since nobody who lives here raises animals for a living, do we name the pie according to our occupations? Photoshop Wranglers Pie? Mom Of All Trades Pies? And why is this dish even called "pie" when it has not a morsel of pastry in it?
So many questions, and sadly, so few answers.
I do know one thing: If I don't go deal with the gravy that is bubbling over the edge of the dish, we may be naming it Smoked Out/Burned Down Hovel Pie.