Muscles. When I'm having a bad day and it seems that people are trying to wind me up, it takes only 42 muscles to frown, 28 to smile and only four to extend my arm and smack someone in the mouth!
// thought I would resurrect this topic "The man who goes alone can start today; but he who travels with another must wait till that other is ready." (Henry David Thoreau (1817-1862)