I spent the first 5 years of my life in South London and in the early years this was in the flight path for V1 and V2 rockets coming in from Germany.
When I was about 4, there was a large earthquake in Persia (now Iran), why I remember the name I have no idea, but I have since verified it, and I remember it because as it was just after the war and when the radio reported it, the language they used, I think they talked of evacuation of getting people out of danger made me immediately imagine that an earthquake was something like an oxygen cylinder at the bottom of a shell crater and lots of man in grey boiler suits and helmets having to get down to it and do something to it before it exploded, which must have been my 4 year old self's memory of the procedures followed for unexploded bombs, of which there were quite a few in our neighbourhood.
As an adult I discussed this with my mother and she said that I would have seen a lot of rocket and bomb craters around where we lived and as quite a number of the V1s and V2s didn't explode, also a lot of Civil Defence men in uniforms like the ones I described, whose task after these events was to evacuate houses and cordon off the area where the unexploded bomb was.