YouTube HQ videos

Simply this is an easy way to watch HQ ( HIGH Quality ) videos on youtube, as most of the videos may have some distortion or bad resolution , this is a simple way to improve the video you are watching, just add ( &fmt=18 ) a the end of any video’s URL, i just tested it on a couple of videos and it did work, i don’t know the real mechanism of such code to be added or how it work but so far i watch higher quality videos,
( Ex: http://www.youtube.com/watch?v=SVpkUR4J5GY&fmt=18) just test it and report me if not working