Reboot a clickwheel /touchscreen iPod / iPhone / iPad

Is your scrollwheel ipod (nano / classic / mini / U2 ) hung ? There's a very easy way to restart it without losing any data and without using a computer. All you have to do is
press and hold the "menu button" and the center button simultaneously for about 6-10 seconds. The iPod will automatically restart and will continue to function normally.
To reset an iPod touch / iPhone / iPad, press and hold the home button and the power button / sleep button simultaneously for about 8-10 seconds and Voila !