http://www.lewrockwell.com/2014/06/brett-and-kate-mckay/do-you-carry-a-pocket-knife/
Why a Man Should Carry a Pocket Knife
1. Opening a box.
2. Cutting rope, tags, and string.
3. Cutting an apple. I love eating an apple that Ive cut with my pocket knife, slice by slice. You feel like a bad ass doing it. You hold the apple in your non-dominant hand and then make a slice with the knife using your dominant hand. After you make the slice, pinch it between your thumb and knife blade. Bring the blade to your mouth and deposit the apple slice.
4. Opening a letter. Sure, you could use your finger, but using a knife is just more manly.
5. Weapon. Not the most effective, but its better than nothing.
6. Camping. How else will you sharpen the point of a stick in preparation for stabbing your prey? And by prey I mean hot dog.
7. You never know when youre going to have to MacGyver your way out of a crisis. Be prepared.
8. You need something to clench in your teeth when swinging from a rope.