In the "Biomorph" episode of Red Dwarf, from Series 3, the crew are harassed by an Alien-type beast which can transmute into any shape it likes, and also has the ability to feed on raw human emotions. Unfortunately, the Biomorph gets these emotions by clamping a large sucker-type proboscis onto its victim's forehead. And it seems to have very little trouble doing this even with Rimmer, who, as has already been stated on numerous occasions, IS A HOLOGRAM!