I opened a new homebrew today. "Black Pepper Stout" that I then re-named "Black Pepper Eclipse Stout" after doing this with my Surefire G2L, 80 lumens, tactical flashlight. That little thing will nock out your vision (temporarily) if you shine it in your eyes, and you will be seeing spots for a long time. But when you use the beer as a filter, you can see nothing.
I knew I made it dark, but I you can always see something!
Tastes fantastic too. The black pepper adds a wonderful flavor, that is not spicy but very up front. Kind of like you just ground a bunch fresh into some soup, and you can smell the dust. State Fair 2010?