No wonder Google has so many promotional t-shirts! According to a blog post that is purportedly from an interview at Microsoft with an ex-Googler, they give out lots of free shirts to employees:
“The culture at Google is very much like the old culture at Microsoft back when the company felt like most employees were in their mid 20s. These kids dont have a life yet so they spend all of their time at work. Google provides nearly everything these people need from clothes (new T-shirts are placed in bins for people to grab *twice* a week!) to food three, free, all-you-can-eat meals a day.”