According to her:
From Batman/Superman Animated (the comic adaptation of the animated movie) comes one of my favorite scenes ever - Superman wandering around his room shirtless while Batman watches him through binoculars. Awesome. Superman says "Touche" because when he met Batman he peeked and found out that he was Bruce Wayne, so Batman put a tracer on him to find out he was Clark Kent.
Bonus Lex Luthor after a workout!