Friends, today I m sharing a very cool and important trick that every body wants....Sometimes u forget your pattern or your cousins mobile who do not know how to reset and he goes to mobile shop and they take about 700rs...So u can now hack that forgotten pattern lock.
Follow the steps
1. Connect your mobile through USB cable.
2. ADB tool (download from here) 
  {Note:- USB debugging must be on }
PASSWORD after extraction: raipurtricks.in
About ADB
Android Debug Bridge (adb) is a versatile command line tool that lets you communicate with an emulator instance or connected Android-powered device. It is a client-server program that includes three components:
A client, which runs on your development machine. You can invoke a client from a shell by issuing an adb command. Other Android tools such as the ADT plugin and DDMS also create adb clients.
A server, which runs as a background process on your development machine. The server manages communication between the client and the adb daemon running on an emulator or device.
A daemon, which runs as a background process on each emulator or device instance.
Procedure:
Now open cmd.exe from the given tool,
     type
adb.exe
Now type the following command-
     adb shell
Than
     rm /data/system/gesture.key
Than
     reboot
NOW WAIT.. YOUR DEVICE WILL REBOOT.. AND WILL ASK FOR PATTERN...,
MAKE ANY PATTERN.., AND YOUR DEVICE WILL BE 
UNLOCKED !!!!
Enjoy!!!