boat
from the episode "Objects in Space"
Jubal Early:"Where'd she go?"
Simon:"I can't keep track of her when she's not incorporeally possessing a spaceship. Don't look at me."
Jubal Early:"That's some nonsensical crap. Ain't nobody can do that. Your somewhere on this boat! Somewhere with a comm, playing games!"
River Laughing
Jubal Early:"That's somewhat unsettling."