I'm a ghost hunter! (The "Para" part of the name is for "Paranormal") But yeah, it happens when you click on them with the mouse. Sometimes when it's raining, I'm clicking around the screen and moving it like CRAZY hoping I'll find one of the rare elusive bugs for my collection, and I'm in such a rush, I end up clicking on EVERYTHING, and then I get startled by the noise they make!
