I have can't remember not having a pocket knife. For the last 35 years I have carried a small swiss army knife which has the tweezers and toothpick in the handle. I think I am on my fifteenth one as I started all my kids with the one in my pocket when I thought he/she was ready for one and broke/lost a few over the years. I'm now working my way through the grandkids. Yes, Miles has it nailed;
If you've never carried a pocket knife on a daily basis, you'd likely not appreciate just how useful they can be.