Earth- Zero Potential,how true.
Lava lamp- nice to look at but useless.
Klunk- A rarther Scottish FS who tended to speak in ultrasound, grunts & whistles, off the cartoon catch the pigeon... Made rarther more amusing when the said FS asked the whole crew room who this Klunk chap was as he had never met him!
Opium- Slow working dope
Dome light-( one for the Herc mates) You had to bash him with a broom to make him work.
Many more that escape me at the moment.