Here's a good one:
Suggest a process to create a city on an ocean square.
Can this city be taken over, and if so, how?
1. Well the easiest way to create the island city is this: create a grassland square where you want your city, found that city, and create a settler or engineer unit. Save the game, adjust the below line in the rules.txt, and re-load the saved game
Grassland, 1,2, 2,1,0, Oce, 0, 1, 0, For, 0,10, 0, Hil, ; Grs
This now says that Grassland can be irrigated to ocean in one turn. So order the settler to irrigate the city square. The grassland immediately changes to ocean.
2. The answer is yes it can: helicopters work. I'd assume bribing would work (I hoped someone would have experimented to test this).
Hmmm...must think of new brain teaser.