Invisible Alex glitch.
In the hotel, there is a hole in a wall (I forgot which floor) and inside you can read (through the hole) "Can't get it off." If you didn't kill the nurse while you're veiwing this message, she will attack you and you will be invisible until you turn off / on the flashlight.
More tricks, tips and cheats for this game are right here - Silent Hill: Homecoming cheats
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