I was playing Half-Life 2 deathmatch with my brother at a LAN cafe and we were having a blast with the gravity gun.
For those unfamiliar, the gravity gun can be used to ‘grab’ objecs in the game and hurl them. One of the objects you can hurl is a toilet! I was having a great time using creative ways to knock people into the next plane of existence.
Another fun thing was to hurl several filing cabinets/barrels/toilets up the air at random, only to have another player inexplicably get crushed to death by the incoming rain of debris.