In all seriousness: Rogue Trader ship-to-ship combat. I bought a bunch of Battlefleet Gothic minis just to encourage my GM to do more ship stuff, so that I could be Horatio Hornblower IN SPAAAAAAAAACE!
Had some fun with it, but the rest of the group didn't enjoy it as much. They didn't really understand the rules, they didn't really want to understand, they liked hitting and shooting things. I want everyone to have fun, but come on guys, make an effort.
When I managed to hulk a well-armed highly-maneuverable raider, taking no damage, in my scrapped-out skeleton-crewed ore-hauler armed only with 4 torpedoes (not 4 torpedo tubes, 4 torpedoes TOTAL,) I was expecting some congratulations. They didn't even understand enough to realize that what I had done was hard.