Alyx Gun (HL2)
A burst pistol that shoots bursts of 3 bullets.

Annabelle (HL2)
A two shot slug shotgun that is relatively accurate.

Anti Hacks Monitors (Zeta)
The HAX! Throws monitors at target.

Briefcase
A briefcase.

Cluster Grenade
A grenade that blows up into 5 smaller grenades.

IsValid() Bar
A joke weapon made during Lambda Players development. It does garbage damage and can pretend to delete players.

Junk Launcher (Zeta)
A rocket launcher that launches a bunch of garbage at the enemy.

Lead Pipe
A one hit kill melee weapon that plays a loud metal pipe sound.

Toy Hammer (GMT)

Make about 18 people fight in a serious war zone environment, but the only weapon they can use is a Toy Hammer

Best stuff I've ever seen

"Failed to load sound "lambdaplayers\loudpipe\lead_pipe_ear_rape.wav", file probably missing from disk/repository"

epic