I really enjoyed this discussion, thanks Scott. I am a goofball at heart, but agree with many others here that it is all about public perception. The general public does not come to their government for humor, they come for answers. If they want humor, they go to Comedy Central or watch an episode of Tosh.0.
We can be funny amongst ourselves, by enjoying the day to day things that bring levity to our lives, like the government acronym soup (I was once on CRAC – civil rights advisory committee) but when we put our public face on, especially where it is documented, I believe we should have the upmost respect for the positions we hold and people we serve by delivering service/information in an unbiased, direct way.