4. PINE BARRENS (Season 3)

It's remembered as a comic high point: Paulie and Christopher botch a hit on a drunk Russian, get lost in the snowy woods tracking him, and end up freezing in an abandoned truck, sucking down ketchup packets for sustenance. But in light of Tony's paranoid housecleaning at series' end, it's the feral way the panicked duo turn on each other that resonates, a reminder how in this crew, survival trumps loyalty. —Josh Wolk