Myocardial Infarction.

I'm still working on stats. And I really need to concentrate. So, when I need to focus, I listen to classical music. Today's selection : Tchaikovsky. And I cranked it. My job can be somewhat solitary, but I do, periodically, have to interact with co-workers. One such person was trying to get my attention during this statistical stupor. She called my name twice, supposedly, and then tapped me on the shoulder. I freaked. I can't even tell you what sort of noise I made, because I couldn't hear myself over the 1812 Overture.