Now that's an impressive video - Tool-assisted speedrun

Some fellow plays Zelda:Majora’s Mask by bomb jumping, exploiting glitches, not getting a single key and making it look good in the process. The fun starts roughly at the 10 minute mark. This is a version without any cutscenes (the youtube page also has a link to a version with cutscenes).

Except that he did use one key when getting the Light Arrows. Other than that these videos are generally very entertaining.