Deadly Premonition Flamethrower

There are seven bones hidden around the map in this game, and if you find them all you should talk to the grave keeper Brian who will give you a key to the gate at his home in town. After this go to the house(it's simply "Brian's House" on the map) and go inside of the gate. After moving some gargoyles out the way you'll come to an area with one last gargoyle and underneath this is the flamethrower which has unlimited ammo.

Special 10mm SMG in Deadly Premonition (XBOX 360)

Go to the Milk Barn convenience store in town and talk to Keith Ingram, choose to buy from him, and he should have one or more 'spiritual maps' for sale (depending on how far you are into the story). Select the first one and he will tell you a ghost story about the tunnel near the lumber mill. Now go outside and there should be an orange arrow on the screen to lead you to the tunnel. Near the middle of the tunnel is an area where you can enter the otherworld do this and you'll be in a round room full of zombies. You should kill all of the zombies, pick up any items they might drop and then enter the door behind you. Repeat this process several times (5 or so I think) and you will eventually end up in a room without zombies which will have two things: an area where you can leave the otherworld(don't do this yet) and behind that a work bench with an unlimited ammo version of the 10mm SMG with a 360 round clip(versus 180 for regular).