Since someone asked what a pot pie was.. A pot pie is a pastry filled with meat, veggies, and some type of sauce, usually something like gravy. They can be made either as individual portions, or family size. They're cooked in a pie dish, just like a regular pie. I don't know where the "pot" comes in at, though.
Pot roast is usually some type of roast cut (rump roast, flank roast) that's actually made in a pot, on the stove top instead of being baked/roasted/broiled. My dad used to make it in his cast-iron pot.. brown the top and bottom, and then boil it for about 3 hours until it's fully cooked, nice and juicy. The leftover liquid is used to make gravy. When made right, it's usually pretty good.
"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited
