Fireworks

Fireworks are a useable item that appear to be found solely in the Dark Carnival campaign. They can be picked up with the Use key (default: "E" for PC; "X" for Xbox 360) and release a field of exploding firecrackers that have an area of effect similar to a molotov cocktail or gas can when shot. A player can not shoot while holding a box of fireworks, but can still melee. There is no inventory space for this weapon, so the only method of transporting it is to pick it up and carry it. They are used to set up traps and provide a strong defense during large horde attacks.

A useful tactic with items such as this is to spread them in an arc in front of you, as flames from a gas can ignite unlit ones, causing a large chain reaction that helps with horde attacks and finales.

Videos
Video:Http://www.youtube.com/watch?v