The Gonzo Gun is a secret weapon found rather late in the game in The Suffering. It's quite literally resembles a chicken. It has the same ammo capacity as the Dual Revolvers and fires, of all things, eggs. One hit kills (you only have 20 eggs and it doesn't kill the final boss).
- When you get the room in the basement where you hear your kid scream behind a wooden door
- Blow up the canisters near it.
- Open the red door and turn left.
- There will be a wooden box.
- Drag it back near the hole in the wall at the top.
- Climb it and you will see a dead guard.
- Later in the game there will be a Gonzo Gun.