6 of 11Image
A nod to old-school arcade games, typing in "Atari Breakout" within Google Images will bring up a game you can play which is similar to the original Breakout series.
An HTML-based easter egg makes your results blink. Searching for either "blink HTML" or "blink tag" will alter your page to reflect this HTML code.
You can also type in "shake" and "tilt" on Google to skew your results page.
Another HTML-based easter egg: If you use the HTML marquee code in the Google search engine box then results will begin to slide across the screen.