Something that most gamers take for granted is the idea that all dice are created equal. But they're not! Here are a couple of videos where a true master of salesmanship explains why most dice are crap:
[youtube=http://www.youtube.com/watch?v=bR2fxoNHIuU&hl=en&fs=1]
[youtube=http://www.youtube.com/watch?v=PxmkWrDbn34&hl=en&fs=1]