Achilles' Heel 性格上的致命弱点或缺陷

B：What's wrong?
C：Last night I noticed something about Two-Face: his coin.
It's his Achilles' heel.
B：I know. You called me for this?
The bat signal is not a beeper.
C：What I wish I could say is that my interest in you was purely professional.
B：You trying to get under my cape, doctor?
C：A girl can't live by psychoses alone.
B：I don't blend in at a family picnic.