So while Astrid dumps more ice on the corpse, Walter and Peter fiddle with wires attached to the top of Smith's head. Walter explains that a brain is like a computer: it just needs electricity to function, which the body stops producing after death. They're keeping the body cold to slow down degeneration.
Walter stares at Smith's bald scalp for a moment, and says, "It's astonishing how this man's scalp resembles --" and he's interrupted by Astrid, who says, "-- Peter's bare bottom when he was a baby?" Walter's surprised that she knew that, until she points out he's already told them that twice. "What did I say next?" he asks. "That we're going to kickstart his brain," says Peter. Walter finds this excellent, and gives Peter some conductive gel to prevent the electrical current from setting him on fire. "Spread it evenly. And don't forget his nipples." Amazingly, no one busts out a "that's what she said!" Walter then startles Peter by taking a picture with a Polaroid. Probably compiling a scrapbook, and who wouldn't want a picture of his son spreading conductive gel on a dead guy's nipples?
Walter readies the equipment and reminisces about a time in the '70s when the FBI asked him to use this technique on some dead guy named James or Jimmy, who'd been murdered; they wanted to find out who his assassin was, says Walter. "Union leader, I think," says Walter. Peter's all, "Jimmy Hoffa?" Yes, of course that's it. Walter blithely explains that he had a "shockingly low electro-sensitivity," so when he turned on the machine, it fried his brain like an egg.
Then he goes on about how everyone has a unique tolerance to electrical stimulation. "Mine, for instance, is remarkably high. Yours, Peter, unusually low." As Walter continues to ramble, Peter interrupts. "You used to do this to me," he says, as though it's just coming back to him. "You attached wires to car batteries and then you would shock me." Walter calls it "accumulating data." "No, you were experimenting on me," says Peter.