Play Google Chrome's Secret Offline Game

Fun Fact: Even wothout an internet connection, Google's Chrome browser offers up a pretty decent way to pass the time

The Dinosaur

That little dinosaur atop the "unable to connect to the internet" message you get when you are offline is actually a playable character in a scrolling game. Just click it from a computer or tap it from a mobile phone. Tapping it again will make the dinosaur jump over the cacti that appear onscreen - which is the whole object of the game.
It's not the most engrossing game in the world, but it's still, by far a more pleasant time killer talking to someone on the subway.