Tab Paranoia
The feeling you get when you switch or close an internet browser tab on a computer for a perfectly normal reason the moment another person walks by in view of the monitor. Typically inherited from repeated cases of having an individual ask "what were you looking at?"
My mom walked into my room the instant I closed Internet Explorer. I was only closing my Steam account, but I bet she thought I was browsing porn. It's probably just my Tab Paranoia.