Let me help you out:
The office? Yes! Call it your "industrial staple remover"
Church? Yes! Demons will shudder to know you have the Sword of the Lord and some Steel.
Elementary school? Yes! Combination ruler and rudimentary compass (you'll need some string and a pencil, too).
Supermarket? Yes! "Don't use that slicer Mr. butcher-man, I'd prefer to cut my own cold-cuts, let me take a step behind the counter"
The movie? Yes! It always more of a challenge to play five-finger fillet in the dark if you get bored with the flick.
College classes? Yes! It is your book weight to keep the textbook from closing while you take notes.
The gas station? Yes! Cleaning the dirt from under your nails with your knife will ensure scammers won't try to solicit you.
City council? Yes! You can accentuate your closing argument by stabbing the knife into the podium. Politicians love dramatic visual aids!
Weddings? Yes! Especially if you are the party of the bride--makes the groom's commitment so much more meaningful.
Funerals? Yes! The dead don't mind, and the living have other grievances to concern themselves with.
To visit relatives? Yes! Who'll be the favorite uncle now!?
Nice restaurants? Yes! Let's be honest. Restaurants don't keep good cutlery on hand. They'll know you're a discerning diner when you refuse second-rate butter knives to cut your steak.
See, you're covered, no problem!