Strange, loud sound
From Glitches
From the game The Legend of Zelda: Link's Awakening for the Game Boy
This only works on the black and white version of the game
Grab anything, like a bomb, and open the start menu, pressing START. Then, press START again and right when the menu is going down, throw the thing you were holding. You will hear a very noisy sound, which will continue until you reopen the start menu.
Submitted by: link_enfant