I had some legitimately scary things that may or may not be tracking but I cannot explain it without tracking. I watch some youtube video where the audio mentions a historic place of battle and then seconds later it shows up in my Google Chrome autosuggestion because I wanted to google some more information on it. I dont see how that is possible, it was a very specific location. I only typed "battle of" and it showed me the exact battle that was just mentioned in the video. I dont see how that is possible unless Google has transcribed the audio of all the videos automatically and uses it for search suggestions. It was nothing I ever searched before, in fact I searched many many other battles and places before that one so it would make more sense for it to show me something I searched previously.