Eric: You know, this whole marriage thing has made me think: why
am I in such a hurry to grow up? You know life is like a train. It’s
bearing down on you, and guess what? It’s gonna hit you! So you can
either start running when it’s far off in the distance, or you can pull
up a chair, crack open a beer, and just watch it come!
Kelso: I did that once.
Eric: No, Kelso. Not a real train… a metaphorical one…
Kelso: Like a… like a ghost train?
(Eric stares at Kelso for a moment)
Eric: Yes… a ghost train.
from the Episode Time is On My Side