Thanks to The Lion and the Cardinal for a recollection from Simon Tolkien of his grandfather, JRR Tolkien going to Mass in Bournemouth. Apparently the English Mass had just been introduced but Tolkien didn't like it. While the rest of the congregation made the responses in English, he made them loudly in Latin, oblivious to the reactions of others.
(See: J.R.R. Tolkien goes to Mass)