I used a regular flatware knife to spread butter on some toast this morning. Yesterday, I cut open a bag of peanuts out of a vending machine that wouldn't tear open easily. Day before that, I cut down a wine box so it would fit in the trash. Day before that, I opened several packages that came in the mail (a large box, multiple smaller internal boxes, and a couple of plastic mailing envelopes).
That's about as far back as my short-term knife usage memory goes.