Here is some video (and stabilized from some really shakey footage using Deshaker, a plugin for Virtualdub) of male and female jumping spiders from the genus Tutelina. Not sure on the species, but the videographer's best guess is Tutelina elegans. The female could be mimicking the antennae movements of an ant. The music was recorded by the videographer.
Video: Thomas Shahan [Thomas Shahan's photostream]