呢單嘢甲推俾乙，乙推俾丙，丙又推返俾甲，但佢哋之間只係口頭應承又無書面證明，咁樣即係口同鼻拗，追問落去都唔會有結果㗎啦。
A pushes it to B, B pushes it to beat, and hits it back to A, but there is only a verbal promise between them and no written proof, so it is a mouth-to-nose problem, and there will be no result if the question continues.