Dr. William Glasser states that one of our basic needs is to have fun. This is just as important for teachers as it is for students.
When I was at Jackson Elementary our principal at the time, Ernie Nix, showed us the film FISH Philosophy about Pike Place Fish Market in Seattle, Washington. They had learned at this market the importance of fun in the workplace. There is also a book Fish! Catch the Energy written by the owner of the market, John Yokoyama.
Principals can do a lot to make the school a place of fun for the teachers. It starts with the attitude. With the right attitude the principal will think of ways to make a teacher's day and be there to provide undivided, caring attention. This is especially important for those teachers who are irreplaceables.