In Towerblaster (available at http://www.y8.com/games/Tower_Blaster), a fun and somewhat difficult online game, you are pitted against your mortal enemies, the Viks, in an attempt to build a numerically stable tower. The Viks' objective is the same, but they are hidden behind a tarp, and shout things like "we're almost done," and "just a few more pieces!" Sadly, your side seems to have a few disadvantages: you are visible to the Viks, you get taunted by the Viks, and if your tower gets blown up, you get to fall all the way down (the Viks get to hang on the the tarp's tower).
...Still, it is an amazingly fun game...
Snowy Owl pillowcases
5 years ago