Electromagnetic barnacle
From Tardis Wiki, the free Doctor Who reference
Maxie Masters, who had worked as a Gendar tour guide prior to moving to Earth, once recalled giving guided tours of Auteur's Babbling Bibliothèque to alien tourists such as electromagnetic barnacles. As a result, she did not find helping P.R.O.B.E. to hunt down "mere" space barnacles a very exciting use of her time. (PROSE: Out of the Box)