Kaylee: Oh! Hey, Doctor.
Simon: You really should just call me Simon.
Kaylee: Oh, I’ll do that, then.
Simon: So, what are we doing?
Kaylee: Oh! Crime.
Simon: Crime? Good. Okay, crime.
Kaylee: It’s a train heist. See, we fly over the train car. The Captain and Zoe sneak in, we lower Jayne onto the car, and they bundle up the booty, and we haul ’em all back up. Easy as lyin’.
Simon: They’ve done this before?
Kaylee: (laughs) Hell no. But I think it’s gonna work.
Firefly – Episode 2 – “The Train Job”