Activision Blizzard announced today that the worldwide sales of Infinity Ward's Call of Duty: Modern Warfare 2 crossed the $1 billion mark, according to internal Activision estimates.

In its first five days alone, the game sold an estimated $550 million worldwide, outpacing five-day worldwide theatrical box office gross figures for such films as Avatar, Harry Potter and the Half-Blood Prince and The Dark Night, according to internal Activision estimates and boxofficemojo.com.

"Call of Duty:Modern Warfare 2 has exceeded our expectations and shattered theatrical box office and video game records," said Robert Kotick, CEO of Activision Blizzard. "There are only a handful of entertainment properties that have ever reached the $1 billion mark, which illustrates the power of the Call of Duty franchise and mass appeal of this game."

EA's probably shooting itself in the foot right about now.