From the game The Legend of Zelda: Link's Awakening for the Game Boy
You need to have that rooster guy who follows you and lets you fly with him. Now, go up to a door as close as possible without entering. Or, you could enter and then exit and turn to face the building you just entered. Pick up the bird and fly forward into the house. Now, through the bird and you will drop and enter the building through what looks like the wall or ceiling. This does not lead to anything interesting but the concept is sort of funny...
Submitted by: kornyhatemachine