I work on the ground and have met a few at check-in, Havent really met any horrible ones, Nicest was Judge Jules (Radio 1 DJ and Ibiza Legend) he was really down to earth and over the moon when I got him an x-leg seat on his flight from BRS-IBZ, we had a chin wag and he even told me the release date of a record I was after and gave me a shout on his radio programme the following week - Comedy!
Also Flava Flav from rap group Public Enemy flying BRS-AMS-CPH, he was really funny and just how you see him in his videos with gold teeth and the massive clock hanging round his neck, although i think security had a few issues with the group as they went through, just try to imagine a couple of dithery old security agents with Bristolian accents trying to tel a world famous US Hip Hop group that they can't take whistles in to the aircraft cabin!