I've had Jack Johnson on my flights too...just as has been said, lovely bloke and even lovelier family. If only others would follow his lead...
Nicole Kidman's mum - as above, only her mum and her bestie - they redefined 'biatch'...seriously, 'don't you know who I am?...No, I don't'...twats.
Had a Saudi royal family onboard (the whole His Highness, etc)...lovely, well mannered, polite...
Joel Edgerton & Cathy Freeman (when they were together)...low key, lovely and polite...
Craig David - lovely guy, entourage was a bit twitchy, but he was fine...
And a few local Oz celebs (well, I use the term loosely), whose behaviour was exemplary in some cases, and embarrassing in others.
Takes all sorts, I suppose.