Strange hospital posters in Stilwater
Get a sniper rifle and go inside Stilwater Memorial Hospital, which is where you spawn when you die. Look around the walls for a couple of posters next to each other, such as on the wall to the right where you walk in. Zoom in on the messages and read them. Half of them have strange messages, such as "Please no: Singing, Dancing, Roller Skating, Smoking, Fishing".