Singing "bum, bum, bum, bum, do-dah, bum," sends Pat Webster’s great-grandchildren into fits of laughter.
While it might be comical for the "young uns", it is actually an important part of the 83-year-old’s daily rehearsal regime as a bass singer in the popular barbershop-style choir, Dunedin Harmony Chorus.
"They make fun of me saying ‘bum’ a lot. It always goes down well."