I just heard a report that says retail clothing stores regularly display a couple of items that haven't been folded right on top of a neatly-piled stack of merchandise. The reason? People feel uncomfortable messing up something that looks so carefully placed...and the "messy" items invite them to pick up, handle, and hopefully purchase something.
How can a little "messy" help you? We tend to see practically-perfect people as unapproachable and distant. Letting down your guard, showing some self-depricating humor, maybe even asking for some help or advice when you don't really need it will go a long way toward winning admiration and respect.
The leaders who aren't afraid to show their human side usually gain stronger and more faithful followers than those who hate to have any "messy" around them.