Misfire may refer to: Misfire (Transformers), the Transformers character Misfire (film), a 2014 American action film Misfire (That '70s Show), an episode from That '70s Show An engine misfire, see engine knocking A song on Queen's album Sheer Heart Attack A malfunctioned cartridge that fails to discharge at all (dud), doesn't discharge promptly (hang fire), or only partially discharges (squib load) when being shot from a firearm. A muzzleloader that does not fire when the trigger is squeezed. See also Firearm malfunction