What if you forgot the android lock to your ipod?

Simply try all of the possibilities, for example, (in order) 0001, 0002, 0003, 0004, up until 0009, then go to, 0010, to 0099, and go all the way up to 9999 until you find the answer.

But, if you are to lazy to do this for so long, simply think of all 4-digit numbers that relate to you. (E.G. pin number, address, zip code, last four digits of your cell number etc.) Don't worry, you will find it eventually. :)