How to watch any video on Youtube in HD

WHERE TO USE THIS CODE:
Most videos DO NOT have "View in Higher Quality" links below them like this video does. So by using this code, you'll be able to watch ANYTHING in higher quality! TRY IT! : )

HERE'S A BETTER EXAMPLE (watch these 10 seconds each):
Low Quality - http://www.youtube.com/watch?v=LPWKag...
High Quality - http://www.youtube.com/watch?v=LPWKag...

HOW IT WORKS: Just enter "&fmt=18" behind the URL at the top, then press enter. WALA! Higher Quality!

THE URL SHOULD NOW LOOK LIKE THIS:
youtube.com/watch?v=27mb_AyzGyQ&fmt=18

SOMETHING SUCKS ABOUT IT THOUGH:
I've noticed that the audio gets a bit worse after watching the video in higher quality though. Weird.