Opus also has a very amusing (but somewhat unfortunate) history of "losing parts"; on several occasions, his "fanny" has fallen off (often with a clanking sound on the floor), and he has also had instances where his nose droops or is taken completely off as a result of sneezing while using dental floss and so on. Sometimes these are combined; he has had either his nose and rear end fall off, or his nose droop while his rear end has fallen off, and so on. He eventually learned that his navel was in fact the screw that attached his rear end to his body.