Thus far, I've been lucky enough that any of the weddings I've been involved with haven't had a bridezilla at the helm. But anyone who works in the wedding industry has no doubt seen their share of them.
And aside from expecting exorbitant monetary contributions from her guests, the fastest way that a bride can usually reveal herself as a bridezilla is to present her guests (and especially her bridesmaids) with a laundry list of rules. The more there are and the more aggressively they're worded, the more likely we are to thank our lucky stars we're not going to that wedding.
But of course, you're not going to encounter many rules of thumb in life that don't have at least one exception. And while she later found that some folks would disagree with this, one bride's list was pretty hard to argue with.