Cilla Black- As stated before-rude and ignorant even though she appears as nice as pie (as on Loose Women today).
Bryan Adams- Couldn't be nicer. Came into the galley and had a chat and even gave me a high five as he left the a/c. Top bloke!
Michael McIntyre- Really nice. Struggling with his travel sick children but was still cracking jokes to his fellow pax in the terminal. Lovely.
Ronnie Corbett- Also very nice. Chatty and jokey.
There are quite a few others but these were the ones that stand out the most