While the census returns of the illiterate were drawn up by the census enumerator, some of the returns filled in by the household were completed frivolously and in some cases the entries were copies as written. Harold Culling found the following entry on the 1881 census which Roy Stockdill posted on the GOONS and SOG mailing lists.
In deaf and dumb column: Can hear the Church bells. Talks to her baby and wears specs when daylight grows dim.
In Hertfordshire I have come across one suspicious entry from the 1881 census.
I have not seen any domestic servant (DS) that young, and neither "Diddy" or "Daddilums" appear elsewhere on the relevant CD. I strongly suspect that they put down details of their dog but can't prove it.
If you know of better census examples from Hertfordshire tell me and I can post details here.