Within the genre, ordinary speech stress is often distorted in the first line, and may be regarded as a feature of the form: "There "was" a young "man" from the "coast""; "There "once" was a "girl" from De"troit"…" Legman takes this as a convention whereby prosody is violated simultaneously with propriety. Exploitation of geographical names, especially exotic ones, is also common, and has been seen as invoking memories of geography lessons in order to subvert the decorum taught in the schoolroom; Legman finds that the exchange of limericks is almost exclusive to comparatively well-educated males, women figuring in limericks almost exclusively as "villains or victims". The most prized limericks incorporate a kind of twist, which may be revealed in the final line or lie in the way the rhymes are often intentionally tortured, or both. Many limericks show some form of internal rhyme, alliteration or assonance, or some element of word play. Verses in limerick form are sometimes combined with a refrain to form a limerick song, a traditional humorous drinking song often with obscene verses.