I have explained the concept of assisted knives and how they differ from automatics to my brother over and over. The worst part is he is a knife guy (at least he collects them) and an engineer. Life is just not fair that I got the good looks and the smarts.
I didn't get a comment just a look of fear until I closed it and put it away. Someone needed to open a plastic bag of food at a team get together for the kids. Out of 24 adults no one could muster a cutting device. The dude that could not rip the bag open then asked loudly for a pair of scissors because everyone carries those. One pseudo-man offered a bottle cap which was attempted.
I held up my mini grip to the bag dude for him to use. He held the bag up to me to open for him. I slowly opened it with my thumb instead of the usual flip. His eyes were glued to me until I finished opening a bunch of stuff quickly handed my way and slipped it back in my pocket. It was weird...for him.