Buried within unseen code on sites like YouTube, Facebook, and Google lie numerous undocumented tricks to entertain and amuse.

There's a hidden world bubbling just beneath the surface of many popular Web sites that we use every day. Buried within unseen code on sites like YouTube, Facebook, and Google lie numerous undocumented tricks to entertain and amuse. Some are only a few key presses away, while others require finding invisible links to secret pages.

These hidden amusements are commonly known as "Easter eggs" in reference to the colorful objects parents hide for their kids during Easter celebrations. In some cases, clever Web site programmers tuck them away to celebrate an inside joke with colleagues. In others, the site developers intend the public at large to discover and enjoy them, which we will do heartily in the pages ahead.

The following eleven Easter eggs are only a handful of those that can be found on the Web. Feel free to share your favorites with us in the comments.