Of all the secret weapons in Silent Hill, the Hammer and Katana are two of my favorites, although not your normal weapons. To get them:

The Hammer
While your exploring the basement of the alternate Alchemilla Hospital, youll have a chance to pick up the Hammer from the Generator Room. Make sure you snag it!The Hammer is powerful, but it handles like a log and you cant walk while its drawn.Enjoy!

The Katana
One of the hardest weapons to obtain, the Katana is available to the lucky/skilled gamers who beat Silent Hill on Hard diffuculty. If you manage to get a decent rating, and got your hands on the Hyperbalster (see UFO ending code), the Katana will appear in the ending ranking screen's circle of Next Fear secret weapons. Using your gold save, start a new game and proceed to the part of the game where you must enter the house on Levin Street. Check the previously locked door inside and it will now be open! Inside youll find the Katana in a small alcove along the back wall.

(For all those who dont know yet the Katana is a really cool sword. Dog Sushi anyone?)