Clark said, "Amazing night."
Lois agreed, "Yeah, really amazing."
Jack said, "I'd call it … unbelievable."
Jimmy replied, "Yeah, I'd have to agree with that."
Jack said, "I mean, if I ever told anybody about it they'd think I was crazy, right?"
Jimmy replied, "Probably."
When I watch this scene, I always get the impression that Jack figured out The Secret, both from his tone of voice and from Clark's reaction.