I thought about bringing up the bivalve fossils found on Mt. Everest that are cited by many creationists as evidence it was flooded, and asking whether they managed to escape up there. ("Clams got legs?") But as OriginalIntent points out, the post-Flood geology has the landscape rising and falling like a whack-a-mole machine, so I figured it wasn't worth bringing up.
How does a very large, heavily loaded, wooden boat stay afloat on such a turbulent sea?
There's the guy in Holland who built a half-size replica that he plans to sail to Belgium and Germany, so we may find out. Of course, he's only going to be carrying stuffed animals.
Methane.