Fire extinguisher
Fire extinguishers were devices used to put out fires. They usually sprayed cold carbon dioxide, and were sometimes used as makeshift weapons.
The Doctor used a fire extinguisher against a dragon which lived in the forest outside the Pied Piper's castle. (TVC: Challenge of the Piper)
Ben Jackson and Polly Wright used adapted fire extinguishers to spray Cybermen with a chemical potion designed to kill them. (DW: The Moonbase)
The Doctor used fire extinguishers against the Primords. (DW: Inferno)
The Doctor sprayed Slitheen with a fire extinguisher, distracting them long enough for Rose Tyler and Harriet Jones to get away from them. (DW: World War Three)
The Doctor froze a Clockwork Droid which was stalking Jeanne-Antoinette Poisson with a fire extinguisher he got from the SS Madame De Pompadour. (DW: The Girl in the Fireplace)
Clyde Langer and Rani Chandra used fire extinguishers to temporarily disable nanoforms. (SJA: Prisoner of the Judoon)