I recently read an article about humor in the workplace and my thoughts turned to Rick Davis, my former camp counselor and author of the book "Totally Useless Office Skills."
After several years as a clown with Ringling Bros. Barnum & Bailey Circus, Rick became a speaker and presenter on the subject he knows best, goofing off. He and his wife, Jackie, also run the Silver Lining Circus Camp in Temple, N.H. http://www.schoolshows.com/silverlining/index.html
Googling his name didn't give me much, but Googling "Rick Davis useless" took me right to him and his videos on YouTube. Check out his channel when you've got nothing better to do. Rick would be the first to tell you that you undoubtedly have something better to do.