It's also an attack performed by Ryu, Ken, and countless others in the popular Street Fighter game series and the thousand other games based on it. The normal fireball (quarter-circle turn down to forward and punch) in these is bluish white, though, and it is only if you are Ryu in Super Street Fighter 2 or later that you even have the ability to willfully let out a red fireball that actually burns your opponent. Strangely enough, though, Dhalsim has always been able to spit out a ball of fire, but no one ever calls it a fireball, because he says "Yoga Fire!" as he does it. I always wondered how he talked and spit fire simultaneously.