<Li> "I don't mind if I do"--Colonel Humphrey Chinstrap's catchphrase, spoken by Jack Train, turning any remark into an offer of a drink . The origin of this catchphrase precedes ITMA, but was nevertheless popularised by ITMA . </Li> <Li> "I go, I come back"--Middle Eastern vendor, Ali Oop . Spoken by Jack Train . </Li> <Li> "It's being so cheerful as keeps me going"--Mona Lott, a depressed laundrywoman played by Joan Harben . </Li> <Li> "Good morning, nice day"--commercial traveller about to offer some sales line . </Li>

Who said it being so cheerful that keeps me going
find me the text answering this question