Wouldn’t be the first time Superman was mind controlled by Poison Ivy.
See how Batman made it appear he wanted to tell Catwoman a secret, therefore making Superman listen extra closely and then letting out that whistle. It’s just funny.
I don’t count this as something he can use on Superman easily, since 1: Superman’s mind controlled here, and 2: Batman himself says that Superman on normal mode would know when to stop listening.
From – Batman Vol. 3 #42
