In 2003 there was a lavish feature film adaptation of James Barrie's Peter Pan. As they had a small appearance in the novel, so too mermaids were given a small appearance in the movie, lasting only a few seconds but a very welcome presence all the same.
In this version, mermaids are dark and mysterious creatures, knowing all that happens in NeverLand, and are never to be crossed. Peter and Wendy visit the mermaids to ask them the whereabouts of John and Peter, who have been kidnapped by pirates. During this visit, one of the mermaids tries to drown Wendy, just as Peter said they would. On this page I have a few screencaps of the mermaids from the final film as well as the behind-the-scenes material on the DVD.