The moors murders.
I was definitely quite young, as I remember asking my mum what a 'body' was.
Possibly as an attempt to avoid the horror of the actual crimes, she described it as what I now know as the torso.
I asked no more questions, but it's fair to say that her fudging of the issue didn't have the desired effect - for many years, if I heard that a body had been found, I pictured just a torso!
The next big event was the Moon landing. I was in primary school and we were all taken into the hall the day after it happened, to watch it on TV.
The first big news event that really meant a lot to me was the Yorkshire Ripper. I was in my mid teens, living in Yorkshire, and can remember feeling uncharacteristically anxious as I walked alone along quiet, dark, poorly lit or unlit lanes in the evening.