While teaching I sometimes got pushed to the edge patience-wise. If the twenty-fifth pupil came out to my desk with the same mistakes in their maths, I'd sigh and mutter under my breath "Ho hum, pig's bum!" But of course the little dears often heard me. When the line of new pupils at the beginning of term stood at my door, one lad looked up at me fearlessly and grinned "My sister says you swear. You say Bum!" My face was awfully red.