Restart your friend's Ipod into diagnostics mode as a cool trick!
This should work on just about any Ipod (except the shuffle.... Duh!)
Step 1: ReBoot It
While at the main menu, press the center button and the play button (bottom one) at the
same time for about 6 seconds.
The Ipod should reboot.
Step 2: Bring It Into Diagnostics Mode
While the little "apple" symbol is displayed on the screen press the center button and the back button at the same time.
It may take a while to load into diagnostics so don't take you fingers off of the buttons for about ten seconds, If it brings up the main menu before then you can stop (it didn't work).
You'll know that it worked if you see something akin to the picture below.
It took me about 6 times to get it right so don't feel frustrated, the touch wheel buttons are really sensitive and the commands don't always work...
Step 3: Have Fun!
The diagnostics menu doesn't do very many practical things, but its still fun to play around with and it
has an option to put the iPod into hibernation, the closest thing I can find to turning it off if I need to
store the batteries.