Wow- all the answers are great- I'll have to try some of those- I personally don't mind watchers, I'll answer all of their questions, doing my best to show them what I'm doing- trying go gain credibility along the way. I find usually at some point they either become bored or the boss comes along & they scatter.

If it's the owner, I'll do the same. If they start to become annoying, I'll stop working & turn to talk with them- they know I'm getting paid by the hour, so they usually find an excuse to leave. If they don't, or if It's a quoted job I'm doing, I jokingly bring up "surcharges" -that always works.