Quote from : Batman: Mask of the Phantasm Movie

Joker: I'm impressed, lady. You're harder to kill than a cockroach on steroids.
The Phantasm: So, you figured it out.
[the Phantasm removes his mask to reveal Andrea Beaumont]
Joker: Gotta hand it to you, nice scheme. Costume's a bit theatrical, but hey, who am I to talk?