The Odour of Farts

Graham Greene, A Sort of Life (London: The Bodley Head, 1971), p. 78:

I cannot remember what particular item in the routine of a boarding-school roused this first act of rebellion—loneliness, the struggle of conflicting loyalties, the sense of continuous grime, of unlocked lavatory doors, the odour of farts (it was sexually a very pure house, there was no hint of homosexuality, but scatology was another matter, and I have disliked the lavatory joke from that age on).