London Bridge
This afternoon I saw on the news that shots had been fired at London Bridge. This immediately set alarm bells ringing. (The last terrorist attack there, I was in the area just the day before.) And it was worse because my brother lives in London, albeit not near any of the landmarks. So reading through the news stories as they came out took up most of my day. At first I thought no-one had died except the attacker, but now the death toll is two innocent people, and that really sucks.
I would also recommend never, ever following developing news stories on Twitter.