When will people learn that you never spin your guitar that way.
Protip: If you want to spin your guitar around your body DO NOT throw it over your shoulder.
Here's the right way. Let's say your right handed.
1. Buy and install strap locks.
2. Grip the guitar with your right hand at the point where the neck reaches the body with your palm touching the strings.
3. Lift the guitar so that your right hand is brought up to your left shoulder.
4. Lean forward slightly.
5. Push the guitar down and around, under your right arm.
6. Use your body to carry the guitar around your body much like what you would do with a hula-hoop.
7. Catch the guitar with both hands as soon as it comes over your left shoulder.
8. Profit.
Reverse directions if you're left handed.
Seriously, watch any video on youtube of people spinning their guitars and you'll find that the ones who are successful do it this way and the ones who fail do it like the guy in the above video.