If you have three yellows and a green and they fire in the order yellow yellow yellow green at the same target then you get a black hole. They all have to be maxed in everything though.
Once Chuck Norris was challenged to a fight. He accepted, lost the fight and died. Do you know why? It is because this man was not Chuck Norris, he was another man. He was challenged to a fight by Chuck Norris, Chuck Norris Killed him in his face, he died and to this day remains dead. Chuck Norris remains...Chuck Norris.