What is the most dangerous / insidious / effective assault Catwoman launches against Batman?
How she seduces him.
Making him believe he should go easy on her since she's a woman.
Both of your answers made me giggle lol.
*bats eyelashes innocently*
:P
To me, the part when she stabbed Batman's flank is possibly her most effective and insidious assault.
Apart from damaging the batsuit and injuring Batman, Catwoman's attack was well planned and executed, since it involved deception, seduction and improvisation - also, it showed she could detect the weaknesses in his armor (not many criminals had previously realized that Batman's costume was not entirely bulletproof).