A couple friends and I sight-read some chamber music for fun yesterday. One of them is taking a class for which she had to make a chart of observed behavior. She chose to observe the number of times each of us swore during the hour or so we played. She and I tied for the highest number; our pianist friend is far more polite (but still had her moments).
Let nobody fool you into thinking classical musicians are genteel and refined; we can swear like sailors at unexpected key changes and the like.