What is the Google gravity prank?

The Google Gravity trick is actually a software application created in 2010 by online software creator Mr. Doobs. It was introduced for Google's Chrome browser but works in any Web browser.

To execute the Google Gravity trick, first open any Web browser, and go to the Google search engine home page. Type the phrase "Google Gravity" into the search box. When the option "I'm Feeling Lucky" appears next to the search box, select it. When this option is selected, a new Google home page appears. After a few moments, the entire screen appears to fall to the ground in a random fashion. Entering new phrases into the search box causes the search results to collapse as well.