Played Carcassonne with the Inns and Cathedrals expansion last night. L worked out quickly that getting a cathedral into a rival's city which they are unlikely to finish is a good sabotage move as a partially completed city with a cathedral scores no points at the end (whereas a partially completed city without a cathedral does).
Within the first few tiles of the game we were fighting over supremacy in a new city and desperately trying to make sure that our two bits of cities joined up to share the points. I managed somehow to block out Leigh's third meeple, which left me with 3 men and him with 2 in the city. He gave up trying to muscle in on the pointage action and instead tried desperately to sabotage my plans by adding a cathedrals and other big city pieces in an attempt to make the city unfinishable. But he was foiled! Marvel at the wonder of the 78 point city!!! See the cathedral! See the shield pieces!