Bat-Mite: Hey, Batman! It's me, Bat-Mite! Your number one fan in the whole universe! I've decided to tag along and help you out! Oh, this is gonna be so great.
In the Batcave in the beginning, if you stun Robin with the sonar suit's sonar projector, and someone is playing as Robin, they will still be alive after being pushed off the side while stunned, and will be able to walk on the water outside of the playable area.