As I began playing the latest snapshot, I did my usual routine of putting music from Opera to listen to while building, there was a slightly louder song during the playlist so I did what I normally do and adjusted the volume through my laptop's touchslider, It did turn down the volume like expected, but it also booted me out of the game and into the launcher.
(I should be using fairly recent Java)
Note: This did not happen by altering volume in any other way: through Windows, speakers or in-game.

What I expected to happen was...:
I turn down my volume from my hardware and expect the software to be unaffected, other than volume changing of course.

What actually happened was...:
The game booted me out of Minecraft and back into the launcher.

Steps to Reproduce:
1. Simply open the latest minecraft snapshot, I'm not sure if the problem is present in 13w37d...
2. When on the game, doesn't matter where (title,in-game,during load), Using a touch interface to adjust volume seems to cause a crash.
3. Minecraft boots back to launcher

If you need some additional info, I can try and fish something out for you.
Just tell me what and where I might find it. Thanks.