A good one for departing pax a game called 'cherios'. As passengers leave the aircraft when a minger passes you by say "Cherio!" and most will respond; "Cherio!" Reserve the cherio only for mingers!
Except we normally play that game differently. We do "Cheerio" for the BOBS and "bub-bye" for everyone else. It's great fun when the person standing next to you does the same reply