Citing "astonishing" first-day sales figures in the UK, the Entertainment and Leisure Software Publishers Association has trumpeted Call of Duty: Modern Warfare 2's debut as a sign that "interactive entertainment has completely come of age." Said Michael Rawlinson, Director General of the ELSPA: "These first day sales figures are astonishing and clear evidence that video games are now mainstream in the UK."Smashing through the estimated 631,000 units sold by 2008's Grand Theft Auto IV, Infinity Ward's slick shooter grossed £47 million (roughly $78.3 million) in first-day sales, which ELSPA and GFK-ChartTrack pair with 1.23 million units sold. Sold to adults, of course! "So, as an 18-rated video game, it is important that this game is not played by children, and parents should be appropriately vigilant," said Rawlinson. "We ask everyone to make sure they check the packaging of games to ensure they are suitable for their players, especially as we enter the festive season when video games are one of the most popular gifts of the holiday."We hope you don't take offense, people of the UK, but some of you have awfully high-pitched voices online.