Maybe even Billy has forgotten>
For our younger viewers I will explain.
A Sweety Mouse was a very popular piece of candy . It has all the details of a proper mouse and was usually made out of marshmallow coated in fine sugar. Complete with tail/eyes/nose etc you were never quite sure where to take the first bite.lol
A bit sadistic when you pulled its head off.(no pun intended).
Sadly they dont seem to be on the market anymore.
Hope this helps

cheers