Pick a Bigger Weapon was created on 2006-04-25.
A weapon is usually made by a proffessional and a rock pick isn't.
If you do not have a weapon of the same class (primary,secondary) then you will pick it up when you run over it. To drop the weapon you are holding, press "g". This allows you to pick up another weapon.
On the 360 you just have to pick up a enemy's weapon.
The Soft Weapon was created in 1967.
Magic Weapon was created in 2005.
Raise Your Weapon was created in 2010.
The Weapon Makers was created in 1952.
The Weapon Shop was created in 1942.
Holy Weapon was created in 1993.
The Cane as a Weapon was created in 1912.
Master of Weapon was created in 1989.
Weapon P.R.I.M.E. was created in 1994.