To load the Google Earth flight simulator, type Ctrl-Alt A or Cmd-Opt A on a Mac. You'll have your choice of planes. Flying is another matter altogether, but the place to get started if you lack a joystick is the Google Earth keyboard controls help page.
If you open a YouTube video, click in the frame right after the video starts loading, then immediately type one of the keyboard's arrow keys, you can start playing a game of snakey on the video as it plays. Don't run into the walls!
Google Maps' pegman character, used to signify the perspective of the street view feature, changes on special occasions. And when he shows up at Legoland in Carlsbad, Calif., he turns into a Lego character.
This isn't a Google Easter egg, and maybe isn't even an Easter egg at all. Instead it's with the sarcasm-laden Let Me Google That For You site, which people can use when others ask them silly questions easily answered with a search engine. This particular cached LMGTFY page, though, sets things off in an unending loop of reloading.