I once had a pax call me over and she looked very frightened. I asked if she was ok and she said "Oh my god we're going down is this normal?" This was just after the captain had made a pa saying we were descending and landing in 15 mins!
Also I was dealing with a pax who had fainted putting oxygen on her etc and I felt a tap on my shoulder. I turned round and a passenger asked me for a glass of water. Yes sir i'll just leave this young girl lying here to get you one!