I had a conversation with a flat earther the other day. He claims that the flat earth isn't perfectly flat, that the closer you get to the "center" its kind of like a hill.
Antarctica, or the ice wall as they call it, spreads all around the outer circle and keeps the oceans from spilling off.
So I listened and asked him what was keeping the ocean at the peak of this "hill" in place (things like the Arctic Ocean, Atlantic and Pacific Oceans), otherwise it would all spill downward effectively flooding Australia, half of Africa and South America as well as leaving no ocean around this "hill".
He turned around walked away with a sigh like it was a stupid question.
Well, it is stupid in the sense that you're assuming his flat earth model uses gravity, it doesn't. They don't believe in gravity.