40 - 1 = ?

Mike, the old man of 39 years that he is (as of this morning), celebrated his birthday today by taking the afternoon off of work and spending it with his four favorite people.  He first met Katie for lunch at her elementary school.  Aside from being subjected to a table full of 7-yr-olds all trying to play April fool's pranks on him, it was nice seeing Katie in her element.  Mike next picked up Michael and spent the afternoon soaking in some father-son time at several local playgrounds (e.g., swinging, riding bikes, digging for earthworms, playing some T-ball).  Finally, the entire family went out to dinner at a new shopping/restaurant development that has popped up in the county, and later returned home for some ice cream cake.  Life is good...