Best I heard...
A member of cabin crew asked if a Mr X could make himself known. When the man pressed the call button she ignored it and made the call again only a bit louder...
CC: Could Mr X PLEASE make himself known!
Mr X (at the back waving his hand) : "I'm here"
CC: "Would everyone please look round at Mr X"
Pause while whole cabin goes silent and turns round
CC: "This is Mr X. He's been two timing my friend and I just wanted to make him especially welcome"