Show: Fringe. Set just after 3:16, Os.
Peter found Walter muttering. "Osmium, lutecium, but how, how--"
"Walter." In his soothing-announcer voice. "Case is over. Let it go."
Walter stood, wild-eyed. "OVER? The search for knowledge is NEVER OVER; surely you realize…to alter the laws of physics! Defy Gravity! Turn Back Time! UNDO WHAT HAS BEEN DONE! Nothing can be 'let go.' I CANNOT LET IT GO!" He flailed, knocked over the equipment stand, beakers crashing. Peter grabbed him. "Walter!"
Walter crumpled, whispered. "It could be the key, Peter. To the reversal. Of everything."
Peter patted his back. "And we…keep moving forward, Walter. To ice cream, maybe?"