This little contribution started off this series. I haven't been flooded with entries but the idea is to send in the best one-liners appearing in the most unlikely films.
One entrant suggests a line from Richard Lester's Finders Keepers (USA, 1984)
“Who’s writing this dialogue? Kafka?”
Then I recently came across this, the final line, from William K Howard's 1936 romantic comedy with Carole Lombard and Fred MacMurray The Princess Comes Across.
"No good ever came out of a concertina".