The Cardassian neck trick is a physical feat performed by Cardassians. Due to their prominent neckbones, Cardassians can only move their heads 180 degrees, compared to Humans who can turn 240 degrees. However, some Cardassians are able to disconnect from their neckbones (similar to humans dislocating a shoulder) and turn their heads 300 degrees. The feat is painful, but very amusing to Cardassians viewing it. (Cardassian Sourcebook) Odo once performed the trick before a group of Cardassian officers. (DS9: "Necessary Evil")