Laudator Temporis Acti

William W. Elmendorf, Twana Narratives: Native Historical Accounts of a Coast Salish Culture (Seattle: University of Washington Press, 1993), p. 5 (quoting Henry Allen, member of the Skokomish Indian tribe):

Myron Eells was the missionary here. People didn't like him very well. He was collecting Klallam words from some Klallam Indians who were visiting here one time. I had to translate for him. So he would ask them for words like father, mother, house, dog, and so on. And those people didn't think much of Eells, so they would give him all sorts of dirty, nasty words, and he would write them down in a book. Then he would try to use some of these words, thinking he was talking Indian, and people would just about bust trying to keep from laughing.

Joseph Wood Krutch, The Forgotten Peninsula: A Naturalist in Baja California (New York: William Sloane Associates, 1961), p. 109:

Of the minor difficulties of Father Juan de Ugarte, a former professor of philosophy who was sent to take charge at San Javier, Clavijero writes: "At the beginning [the natives] were very restless at the time of the Catechism. Often bursting out into loud laughter. He noticed that the principal reason for the mockery was his mistakes in speaking the language, and that some of the Indians, when he consulted them about the words or pronunciation, intentionally answered him with absurdities in order to have something to laugh at in the Catechism and for that reason, from then on, he asked only children about the language, for they were more sincere."

Francis Parkman, Pioneers of France in the New World, part II (Champlain and His Associates), chap. VI (Jesuits in Acadia):

[Father Pierre] Biard's greatest difficulty was with the Micmac language. Young Biencourt was his best interpreter, and on common occasions served him well; but the moment that religion was in question he was, as it were, stricken dumb, the reason being that the language was totally without abstract terms. Biard resolutely set himself to the study of it, a hard and thorny path, on which he made small progress, and often went astray. Seated, pencil in hand, before some Indian squatting on the floor, whom with the bribe of a mouldy biscuit he had lured into the hut, he plied him with questions which he often neither would nor could answer. What was the Indian word for Faith, Hope, Charity, Sacrament, Baptism, Eucharist, Trinity, Incarnation? The perplexed savage, willing to amuse himself, and impelled, as Biard thinks, by the Devil, gave him scurrilous and unseemly phrases as the equivalent of things holy, which, studiously incorporated into the father's Indian catechism, produced on his pupils an effect the reverse of that intended.

Francis Parkman, The Jesuits in North America in the Seventeenth Century, chap. IV (Le Jeune and the Hunters):

At the outset, he had proffered his aid to Le Jeune in his study of the Algonquin; and, like the Indian practical jokers of Acadia in the case of Father Biard, palmed off upon him the foulest words in the language as the equivalent of things spiritual. Thus it happened, that, while the missionary sought to explain to the assembled wigwam some point of Christian doctrine, he was interrupted by peals of laughter from men, children, and squaws.

Hat tip (for the first quotation): tarnmoor.