In Shifting Sand Land, Course 8, go to the Bob-Omb buddy if you haven't opened the cannon yet. Open the cannon, then injure yourself down to a little less than 50% health (two bars works best). Get into the cannon with a Wing Cap. Then shoot as far up and left as the crosshairs can go. If it was positioned correctly, you'll hit an invisible wall and fall staight back into the cannon! Shoot out and you'll fly around with the Wing Cap on and no power left. You'll continue to fly around until your Wing Cap disappears.
Submitted by: SHADOWMARIO10