Terrorform - S5-E3
Trivia: The Self-Loathing creature from "Terrorform" was based on an unused design from Doctor Who (1963).
Trivia: When Lister is trying to explain that he knows Rimmer, he mentions "Your middle name is Judas but you tell everybody it's Jonathan" This is a fun-fact because Chris Barrie's (who plays Rimmer) middle name is, in fact, Jonathan.





Answer: The cello is a large four-stringed instrument, which, when it is played, stands vertically on the floor between the player's legs (assuming they are seated). If it is to grow as large as the other instuments mentioned will, it would require a rather unseemly lack of femininity to be able to encompass it with the legs.
Rooster of Doom