Bunny Kill You
There has always been a nice contrast in letting something cute and cuddly turn dangerous and even deadly. You can find lots of animations, pictures and movies featuring soft small creatures e.g. deadly bunnies. My favourite incarnation of this stereotype is still Big Bunny.
However, please notice that there is a limit to this dramatization effect, for instance, letting sheep turn deadly and were-like did not do it for me...
Titel courtesy: a print by John Lurie (unfortunately you won't find it on his website)
Illustration by Gallery Hovel