Some real "fun" comes when you're working in a very small house (lets say 60 seats in the round), and you have cast members who have to be preset onstage from the house opening. It's hard to convince them that all the "Reserved" signs that are around the room are just friends and not, say, reviewers from the New York Times, or Vanity Fair.
The best method I've found for dealing with those situations (big reviewer in the small space) is, if asked, to lie about who's coming preshow, and then come clean to that person post show. That way, if they blab to someone who doesn't want to know it should hopefully not rattle their cage. Some days it will just be a few random small .com reviewers that isn't worth being worked up over (thus helping the ruse when I use it in the future), but every once and a while, it's a guy from Playboy...seriously, I got a show reviewed in Playboy. That was hard to keep under wraps from anybody