Google Tricks

Google Zerg Rush-Its where little O's attack your search options and you click on them to kill them.
https://www.google.com/?q=zerg%20rush

Google Earth Flight Simulator-It is where you can fly an animated plane around the earth where ever you want to fly.

Google MentalPlex-It trys to read your mind on what you want to search over google.

Google Barrel Roll-It rotates the web page a full 360 degrees.