I don't agree that hissing is a bad thing always.  I had a little deaf
girl named Dixie years ago.  I taught her to roll over with hand signals,
and then she got a treat.  She thought if she rolled over at something
she would be rewarded, so she would roll over in front of a closed door,
or the kitchen cupboard she played in, I suppose thinking she would be
rewarded by them opening.  Which she usually was if I saw her.  My point
was that she would hiss at them while rolling over.  Sort of a "hello,
don't you see me here!!!"  If she wanted someone to play, she would
ambush them and then hiss.
 
--
Pat BEby
[Posted in FML issue 5152]