I heard a story from an electrician who was finishing a job started by a second electrician. The stucco crew covered an outside receptacle and the customer decided that he didn't want the receptacle, anyway. The first electrician phoned the second electrician for information. The conversation went something like this:

1st: Where is the feed for the plug?
2nd: It's at the panel. I marked all the wires.
1st: Yes, they're all marked, but it isn't there.
2nd: Maybe I fed it from an inside plug.
1st: Which one?
2nd: Try the centre of the East wall.
1st: Okay, got it. By the way, It's code that you can't feed an outside plug from an inside circuit.
2nd: I know. I always use a separate circuit for outside plugs.

Is it possible that electricians who claim perfection have really short memories?