Search "do a barrel roll" and watch the page do a 360 turn.
When you search "tilt" the page appears at a slight angle.
When you search Google for "marquee html" the amount of items marquees across the page.
Search "blink html" for all the occurences of "blink" and "HTML" to flash.
When you image search "Atari Breakout" you get to play breakout with the images.
Search Google for "Zerg Rush" to play a game where you defend the results.
