A young lady walked into the bank entrance just in front of me. She walked with a limp but her whole being beamed. She got on the escalator and rode to the top turned the corner and came down the return one. Yes she was mentally deficient by our standards, but because of that she was able to ignore the constraints a 'normal' person would have and derived much pleasure in this simple act.
What is more she gave me and others a joy in her action, I know I wish I could throw off convention and ride the wave of delight in the same way.