Addendum.

Also, after the field trip, when we were waiting for the bus, one student was like, "I'm glad you did a good job not swearing in front of the Mormons.  I was wondering if you were going to slip."

Also also, that day my coffee thermos had leaked in my bag, and a university library book on Mormonism that I had checked out had gotten soaked in espresso, and I was afraid my bookbag would smell like coffee for the field trip.