It looks like the entire first two minutes are played on the G string.  Does it get any crazier than this?  Please share.  I'll bet there are some other "modern" compositions that go beyond this.

https://www.youtube.com/watch?.....teq6awLkOE

How about Vengerov?  His disclosure in expression adds intimacy to his performance.  You really feel like he is sharing something with his audience.  

I like to practice in front of a mirror and when I am sweating over some difficult exercise, I catch myself with the occasional odd expression.  It is not an idle display.