Though it's had the record taken away since it first opened, AT&T Stadium, where the Dallas Cowboys play football, once boasted the world's largest HDTV screen. At 70 feet high and 160 feet wide, its scale is utterly mind-blowing. So of course Conan O'Brien used it to play video games.

After their giant screen blocked a punt, you'd figure the owners of the Dallas Cowboys stadium would be extra careful with their massive displays—but it looks like somebody didn't shut down his computer properly. Whoops! [Thanks, Richard!]

The current largest video screen in the world, in the Dallas Cowboys stadium, measures an insane 159x71 feet. Feet! And what better way to show that immensity off than by playing a little Gears of War?

The 25,000+ square feet display just debuted today at the Dallas Cowboys stadium. It's the world's largest video screen.

The Dallas Cowboys will be taking over the world's largest video screen crown from that Japanese race track in 2009. Their HDTV will be a total of 11,200 square feet-actually bigger than when they were talking about this back in 2006-which beats the 8,066 sqft. Tokyo Racetrack one by quite a large margin. If 159 feet…