When you walk to another screen or room, as you are crossing right in between both, press select to bring up the map. If done correctly, when you exit the map screen, you will be on the other end of the screen you moved to.
This can get you over barriers to finish levels easier, or you can use it to glitch to places you aren't supposed to be. Be warned that you can mess up your game by doing this, and/or get stuck in walls and have to restart.
Added by: Sallad91191 Jul 2nd 2006, ID#4230