+1
Yeah, I buy previously-viewed rental copies from time to time, maybe a couple or few each month.
If you buy them from a rental outfit like Hollywood Video or Blockbuster and such, they're 100% guanteed - if they don't work, bring 'em back. I haven't had to bring any of 'em any back yet.
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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra