There's a store that everyone despises. It's called Wal-Mart. These are a few simple rules of shopping at Wal-Mart that I had to explain to my father the other night, when he was complaining about his *gasp* ONE bad experience at Wal-Mart. I hate Wal-Mart because it's reasonably priced, and yet I can never seem to get through there without incident. I encourage you to add your own "rules" based on your own experiences, as well as rules for other stores/services.
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Mediocrity at its most average.