The Massacre of Hardhome

This moment from S05E08 was bone-chilling. Hell broke loose when the freezing winds blew, signalling the dead's arrival. The divide between free folk and westerosi men vanished as they fought for their lives, hacking at wights while running for escape. Still, the living couldn't win as slain men only respawned again as corpses. At the end, when there's only few survivors left and the army of the dead were staring back as they sail away, the silence was deafening and at the same time terrifying.