Fireworks

Fireworks are a usable item that is found solely in the Dark Carnival chapter, The Concert. 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 cannot 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. Essentially, these are a gas can replacement, and five or so boxes will always be found in a crate opposite the stage during The Concert.

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

Fireworks do more damage to Infected than fire does, although they will be lit on fire. It also can ignite other fireworks and explosives.

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