The resemblance of the medieval ſ (long s) to the letter f is an excellent source of unintended humor when reading historical documents. Perhaps my favorite example of this is William Hayes' aptly-titled catch "The Thirsty Vampires," published in 1763:
[Image ID: Sheet music of "The Thirsty Vampires." When substituting the letter f for long-s, the first line reads: "the thirfty vampires fome believe, their graves can pierce and coffins leave, to fuck poor mortals dry, to fuck poor mortals, to fuck poor mortals dry." End ID]












