I've never played an investigator before, so I thought I'd read up on it first before trying it out. I found this little tidbit on the wiki:
Also, Investigators with no love for critters crawling at the outdoors can misuse their magnifying glass to fry the insects and making them explode, negligibly boosting fun for the Investigator. This can also be done at night time, strangely enough.
That made me lol. I've never head of that before!!