Go to Sakon's hideout when you shouldn't
From Glitches
From the game The Legend of Zelda: Majora's Mask for the Nintendo 64.
Go to Sakon's hideout on the first or second day. Put on the bunny's hood and then hold down the Z button and roll at the right crack of the entrance of the hideout. You want for the camera to be focused right behind you, and the wall should be directly in front of you. Eventually, you'll roll through the wall and jump behind it. Most of the time, you will end up in Sakon's hideout. If not, you will fall into an area of water and then get transported back to the entrance of Ikana Canyon. Once you get in, you can now explore the place. Kafei will not be there and there will be no intro Kafei cut scene, but you can still sort of make progress through the area. Turn into the Goron and stand on the switch. Now, quickly roll to the next room before the door closes on you. If it closes on you, you will be warped out of the hideout. You can then complete the task. Kafei will then appear, only for the movie scene, and you will warp back to the door-opening switch. You can then kill the baba. Then, go back to the other side by rolling to it from the switch. The room with the many switches is the farthest you can go- from what I know. You can however kill one of the babas on the other side with your sword. Some strange things to note: although the conveyor belt is moving, the mask is not - it stays in one spot. Also, if you stand by the bottom wall of one of Kafei's rooms and put on a transforming mask, the camera will get a weird angle showing the purple outsides of the area. Probably this is because the camera was not meant to zoom in to a head-on view in this area. If you do this whole glitch during the third day, everything will happen as normal, but you can still do glitches (like the one below).
Submitted by: kornyhatemachine and Connie