Google created a new hidden game into its search engine recently. Every time you search "zerg rush" you will suddenly find yourself in the middle of a zerg rush, a tactic invented in Starcraft and later used in many other RTS games.
You have to be careful with your personal information when using the internet forms. Don't give out any personal information unless it is absolutely required in order to make some sort of transaction (even then, be careful about what sites you use your information).
This infographic explains the situation of what's really behind the scenes in the internet.