I had so much fun...
Picking stuff up with the gravity gun and sitting in a corner was fun. It seems the gravity gun casts a shadow.
Crowbarring people was awesome. I managed to die a few (4 or something) times to random spam by standing behind someone getting shot. And someone pointed a rocket at the ground. Cornering people was the most fun, though. Crouching down and bashing peoples legs while they tried to get out of a jail cell was funny.