What you have to do is reset your ipod ( by holding home + ok button down for 5 seconds) and when the reboot screen appears, you have to press ( and keep pressed ) the home button and the rewind button, until the secret menu appears
Here you will be able to test the functionality of your buttons, hold button and so on.
Its not much, but it will scare the hell out of your friend when u do this to his ipod
cheers