A speech impediment that strikes vampires (and other fanged creatures, as well), where their spoken s's become ths or, more often, shs. Here's the technical explanation for why it happens: False teeth tend to cause sibilants (s, soft c, like the first c in "circus", and sometimes z) to be mispronounced because the prosthetics force a change in the position of the tongue. Interdentals (th) are made by the tongue going against the upper incisors - sibilants are more likely to be mispronounced as interdentals when the incisors are altered or missing, as with fake buck teeth or missing front teeth More common with prosthetic fangs are for the sibilants to become post-alveolar fricatives (sh), caused by the tongue being forced back by the wider and longer canines. For example, listen to anythin