Help settle an ages-old argument.
Into which category would you place cheesecake? Is it a cake, is it a pie, or is it something all its own?
It is obviously a pie despite the name.
Crust with filling. It’s a pie.
You can make a cheesecake pie - that is a piecrust with a cheesecake filling. But a real, traditional cheesecake is not a pie. Nor a cake, for that matter.
And lo, the great AB proclaimed, “Cheesecake isn’t a cake - it’s a custard”.
Thus spake AB. Hallowed be his name.
Well, if you put blueberry filling on a buttered graham cracker crust, would you call it a pie or cake? That’s your answer.
What of cheesecakes without crusts?
Who is AB? Because I totally agree with him.
St. Alton
Okay, I don’t always agree with HIM, but it contains eggs and needs to be cooked so they set up. A custard.
Ooh, a new contender. This is intriguing.
Neither. A cheesecake is sui generis.
The category of my stomach! 
I voted neither.
It’s a form of pie.
And a Boston Cream Pie is actually a form of cake.
I have had cheesecake type pie before. It has a graham cracker crust in a pie pan and is refrigerated to set instead of bake. It seldom has eggs in it. (as in almost never.)
Real cheesecake to me is the New York baked cheesecake. That is nothing like a pie. It is also nothing like a cake. Cheesecake is it’s own type of desert and is not part of a larger group. (I will disagree with Alton on the custard thing, not that my opinion means anything at all.)
cheeseCAKE
How much more obvious could it be?