Single Status Update
...Is when some poor shmoe thinks he's got me cornered and a big-ass desk with my name on it. Fortunately, Grav-Gun Volleyball is an underdeveloped skill-- so it usually takes people by surprise when I splatter people with their own trash.
Another evil thing I enjoy is sitting on the 3rd floor of Overwatch-- I camp in that little cubbyhole to the right of the stairway exit, so anyone looking to camp with the rocket launcher gets a filing cabinet upside the head and no idea where it came from. With some luck, I can do that a whole 20 times before people catch on.
Also, Rats maps for CS:S are a good thing.