I still have occasional nightmares about Threads (https://en.wikipedia.org/wiki/Threads). Mostly about the milk bottle melting.
Possibly the scariest TV show I've ever watched - largely because it was set just down the road in Sheffield.
https://www.youtube.com/watch?v=9GJttnC8PoA
You almost got the idea that the BBC didn't approve of nuclear warfare.
NB A thing worth noting about Threads is that is based on a nuclear attack scenario that is regarded as rather optimistic - a real Soviet attack would probably have been much worse:
Recorded in 1965, but not shown until 1985 as
"the effect of the film has been judged by the BBC to be too horrifying for the medium of broadcasting. It will, however, be shown to invited audiences..."
"the sound of the blast from a thermonuclear bomb has been likened to that of an enormous door slamming in the depths of hell."