I've had only a couple memorable eperiences-
One time in a Borders book store I used the scissors on an Officer's model to cut a gift certificate from the card thingy, and the register clerk actually refused to help me and made me go get rung up by the manager because I was brandishing a weapon. Yes, a .75 inch pair of double bladed sekret ninja POWER, baby.
I had one of the local police dispatchers talk to me about my EDC fixed blade a while back. It's this one:
(since overwrapped with green 550)
first blade I ever forged, all of 4 inches of cutting edge, no guard, no tactical nuthin. It's harder than hell and cuts like a laser, and it's the first one I forged, so I keep it.
She was asking me why I carried a weapon. I explained the various tool uses it performs through the day, told her it was far more useful and far less of a weapon than a hammer. She decided that one of the local cops would probably stop me for carrying it because it could be considered a weapon.
At this point in time I'd been taking hapkido for 2 years. I weigh 220, and can lift some of my classmates off the floor with a punch (the smaller ones. For medium sized peopl it takes a front kick). This doesn't make me special, anyone with my mass and a couple months of lifting could do the same after 2 years of training! I told her that there was no way in hell I'd risk my hands on a guardless 4 inch blade when I could just hit someone.
These days, everyone EXPECTS me to have a knife. I've mad a dozen or more of the ones used in the local restaurants and several of the hunters and local outdoorsy students have blades I made. Everyone knows what I do for a living, and it's be pretty strange for me to not have - not only a knife- but the RIGHT knife
Now, this whole topic leads me to a conclusion. Since this applies to multitools and SAKs as much as citizens, Striders, and Emersons- maybe it's the threat people feel from seeing a person being prepared to Do Stuff. Sounds funny, but it ain't. Doing Stuff scares the shit out of people. And people who Do Stuff outside of movies make sheeps VERY VERY uncomfortable.