Card-counting demonstration
The standard card-counting demonstration that I do, flipping through a few decks and then telling you exactly what cards are left in the last 1/4 deck or so usually gives someone that uses a standard linear number line type system (such as hi-lo, Hi-Opt2, etc.) an idea of what the possibilites are. I hope it was interesting and informative for you, possibly showing you that enough devotion to this pasttime can greatly enhance your expertise and show you that there is always more to learn and study.
Few people even understand Tarzan count. Flash is the only person I know that fully comprehends all the details and ramifications of it.