In the first level of Browntown, Dookie Dookie Panic, immediately as the level begins, there should be a wall at the bottom of the screen that is brown and has cracks in it. If you have the power glove, break the wall, and continue through the opening that you've created. In the middle of the room that you enter through the broken wall is a controller sitting between a bunch of traps and enemies. Neutralize the enemies, avoid the traps, and the turbo shot is yours. Note: It allows you to charge your gun, not shoot rapid fire.