my son forgot user passcode to ipod touch

Hi saugust,

You have to hook it up to the last computer it was sync'd with and restore it:

1. Connect the device to the computer with which you normally sync and open iTunes.
   Note: If iTunes prompts you to enter the passcode, try another computer that you have synced with. Otherwise, go to "If you have never synced your device with iTunes", below.
2. Right-click the device in the left column and select Back up.
3. When the backup is complete, select Restore.
4. When finished, restore from your most recent backup.

If that doesn't help, here's the whole article:

http://support.apple.com/kb/HT1212

Cheers,

GB