Android sillyness I just discovered. Easter egg
Probably way old news, but I only just found out about it.
Go to your phone settings. Touch on About Phone (or About Device - usually at the bottom). Press (several times) on 'Android Version'
Android 4.1 and above, press and hold on what you see for even more fun.
Oh and on 4.2 & 4.3 you can press on what you see after that too!!!