> but there is no other explanation other than it used my microphone to listen to my conversation at work You'd have not noticed if you saw a backpack advert a

> but there is no other explanation other than it used my microphone to listen to my conversation at work You'd have not noticed if you saw a backpack advert at some other time. Just how many adverts do you see that aren't standing out? Huge amounts, probably. This could be quite easily explained by the frequency illusion.