A lady was having a very loud conversation with no headphones in a lounge. Mr W (6ft2 and rather well built) went over and very politely interrupted the call (apologising to the other person too!) to offer her a pack of unused and sealed earbuds, since she didn't have any. She was rather taken aback and brushed him away brusquely. On his walk back to me, he got a round of applause from those around. She did shut up soon after that.
Funny thing was that we ended up queuing on the jetbridge behind her. She seemed most uncomfortable with much harrumphing and tutting generally, but nothing directly aimed at us.