Google single-handedly cost the world approximately $120 million on Friday.

After launching their tribute to Pac-Man on the game's 30th anniversary, tech firm Rescue Time - a productivity company that specializes in mapping their clients' web habits - started crunching the numbers to see how people's Internet habits changed in response to the free game.

The conclusion: The average user spent approximately 36 seconds more time on google.com on Friday, as compared to any other Friday. With more than 500 million visitors to the home page that day, it added up quickly to more than 4 million hours of lost working time.

Of course losing $120 million - spread out across the entire world - isn't a huge loss, comparatively speaking. Especially considering that the folks at Rescue Time estimate that fully 75% of people who visited Google.com on Friday didn't even realize they could play the game.

"Leisure surfing is critical to productivity," wrote Rescue Time's Tony Wright on the company's website. "There are quite a few studies to back this up. We just thought it was interesting number play."