Peppy would be proud. Searching for Starfox 64 and now Internet star, Peppy Hare's signature catchphrase "do a barrel roll" will now cause Google to indeed, do a barrel roll.
According to Google (via abcnews):
Today’s fun query, ‘do a barrel roll,’ was created by a Google software engineer with the primary goal of entertaining users — while showcasing the power of CSS3, a presentation feature of modern browsers. The “do a barrel roll” query, which causes the search page to spin, will remain in place for a while.”