This a glitch that allows you to "fly". You continuously climb using the ramp and can do really high flying moves. In order to pull it off, go to the ramp area first. At the ramp, run towards the edge and press circle to fall. While on the floor, roll in the direction of the ramp edge and you'll be floating off ramp. From there, you can then climb the ramp again as if you're below it. Now you can repeat it over and over to get high. Don't go to high off screen or else the game freezes.