My favorite Easter egg of the bunch, Ookla's Speed Test app for iOS contains a devious kitty that promises the haunt you in your nightmares. To find this evil cat after which the company was apparently named, open the Speed Test app and run a test like you normally would. Once the test is finished, put your finger on the speedometer and pull it down to reveal the cat in question. You can keep pulling down the speedometer to reveal even more amusing messages.

(Thanks to )

A user on the MacRumors forums found this neat little trick:

Go to Safari on your iPhone and completely clear out the URL field. Once you do that, type in "YouTube://" and hit "Go". Safari should close, and the YouTube app should pop open. In older versions of iOS (pre-3.0), a 48 minute long video of Russell Peters doing standup would then appear.