you can do this with google search autocomplete, and it's especially effective on corporate WiFi at revealing co-workers search interests

"Why is my..." "when do we..." "how to ask..." "How do I..." "how to tell if i got" "divorce attorneys <city>"

While this post may seem unsubstantial at best, my point is to never search for anything personal while connected to a shared wifi network - even if you're doing it from the privacy of your own device.