I like to share an anecdote that at a professional conference, some agents from the ATF came to give a presentation regarding updated regulations and found that

I like to share an anecdote that at a professional conference, some agents from the ATF came to give a presentation regarding updated regulations and found that their laptop couldn't connect to the projector. No biggie, I had just finished my presentation and offered to let them use my laptop. The moment they plugged in the thumb drive with their presentation, my virus scanner went apeshit about something on that drive. I kept that laptop disconnected for the rest of that trip, and nuked it once I was back home.