The lowliest weapon in UT, the impact hammer requires no ammo, and is a melee only weapon. Holding in the primary fire causes the hammer to suck in air, charging up to touch someone, gibbing them instantly. Tapping either the primary or secondary fire results in a weak blast of air shooting forth.
Primary damage is, secondary results in death if fully charged.
The impact hammer has several less obvious uses. First off, in the hands of a deft player, it can be used to deflect incoming shots. Rockets, razorblades, even the nukes fired from the redeemer can knocked out of your way with the hammer. Also, the hammer can be fired into the ground, causing the player to fly into the air higher than he or she could normally jump. Another melee only weapon, the chainsaw has two attacks.