Easter egg: On disc 1 of the Red Dwarf series IV DVD enter the 'select episode' option. Before you reach the episode menu there is a sequence including a scutter which grabs a tape. When you see the scutter with the tape press enter and you will be taken to perhaps the best easter egg in all the Red Dwarf DVDs, the Red Dwarf actors actually having an easter egg hunt during the commentary recording session.
Easter egg: On disc 2 of the Red Dwarf Series IV DVD go to bonus features and enter the plain text menu. Press down until you highlight 'back' then press left to highlight the paddle from 'Meltdown'. Press enter to see the animated short for this series with Ed Bye, Rob Grant and Doug Naylor.
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