I prefer more professional up front and more light-hearted in back (and agree with the post about keeping my glass filled...enough said).

One recent examples was from a recent Delta flight where the pilot announced the following after the cabin doors were closed "well, we're all set to depart, but my scanner tells me that we have two laptops, 8 cell phones, and 18 blackberries on at this time so we cannot depart." A moment later he stated "okay, we're now waiting on 8, 5, 2 blackberries...okay...we're now ready to go..." Most of us knew that he was joking, but some people seemed to take him seriously...nice touch. I wish that somebody did that on my last flight when the yahoo next to me wouldn't turn his cell phone off after numerous announcements until I gestured to a FA to finally tell him personally.