As I was writing this, I rewatched the scene that directly preceded this one -- when Jacuzzi is fighting the flamethrower-wielding Ghost. When I first watched it, I thought Jacuzzi's battle line was really stupid:

(Upbeat swing music starts to play.)
Ghost: Stupid! What do you think you're going to do unarmed?
Jacuzzi: I've got a gun... in my heart!
(Tackles Ghost off the train.)

It was only when I rewatched -- and then, only because I had a specific, other scene before that -- that I realized Jacuzzi was repeating something he'd heard earlier.

This show rocks.