When you catch Batman brooding in the Watchtower…

Hal: Hey, Mr. Grumpy Bats. When life gets you down, do you know what you’ve gotta do?

Bruce: *grits teeth* No, I don’t know what to do.

Hal: *singing while flying around the Conference Hall* Just keep floating. Just keep floating. Just keep floating, floating, floating. What do we do? We float, float!

Bruce: Jordan, no singing.

Hal: Ha, ha, ha, ha, ho! I love to float. When you want to float, you WANT to float!

Bruce: *groans*

Bruce: *heads to his teleportation tube*