Mine is Balloon Race. It's an absolute corker, mainly because it is infuriatingly impossible to work out a winning strategy for it; although we have loads of theoretical ones none of them seems to work. It depends on bluff and memory - the latter of which goes a bit wonky once we get onto the second bottle of wine... I bought our copy on eBay, and then went two years without winning a single game! I also like Hare and Tortoise, because I usually win that The Germans do seem to be very good at inventing board games, don't they?