quoting Pthagnar:

there is a parallel english obsession among certain horto-fetishists about competitively growing enormous marrows, though. the two things may be related because i don't really know what you can do with marrows if they get as big as the marrow-fanciers like.

on this side of the the ocean the same obsession famously exists but it's with pumpkins
aaaaaaaaaand from having made mead and cider i can tell you that you don't need to confine your brewing to fruits with enough natural sugar in them, you can add more sugar or honey to pretty much anything and brew with it