After defeating the Riddler, the Siren (who you have a long rival with each other) went to Gotham City Police Headquarters and brainwashed Commissioner Gordon into sneaking into the Batmobile's trunk in order to find out Batman's identity. The Siren later hypnotized Bruce Wayne into signing his fortune over to her and intended to then make him jump off the roof of his office building, but fortunately Robin and Batgirl to intervened.

Until one day as you trying to piece together a weakness for The Siren and possibly land her in jail with her cronies but it was long and difficult to find a solution until she walked in swaying her hips and singing a soothing song.