Easter egg: In the 2 Disc set of Red Dwarf Series I, on the 2nd disc, go to bonus material then photo gallery, then press right which takes you to a photo, click it and you'll see how the ending of Lister and the two babies was made.
Easter egg: In the 2 Disc set of Red Dwarf Series I, on the 1st disc, go to Select Episode and then move it to the right where it says 4691. Then enter the code 4691 into the panel and you can see a documentary on Future Echoes.
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