The 6th documented use for a pocket knife was actually accomplished not by my knife but by my brother-in-law’s newly purchased, spring-assisted knife bought from an Army-Navy store locally.
We were hanging a tire swing from a board bolted to two trees, and needed to pierce the sidewall of a good sized, AT truck tire. We needed three small holes to thread a large rope through, after which we knotted the end to keep it from passing back through.
The whole operation went quite smoothly except the knife being used demonstrated a rather scary failure of it’s blade lock safety device. It took a great amount of force to push the blade through the sidewall, and the first hole taught us quickly that the blade-lock on this new knife was not to be relied upon. The blade closed while trying to stab the tire, and only the quick hands of my brother-in-law saved his fingers from being choppped off.
The lesson here? You get what you pay for (the knife was only $10) and don’t rely on the blade-lock until you have seen it withstand the amount of force that you need for the task. Also, keep in mind where your fingers, hands or other body parts are when applying great force while using a pocket knife as it may not go as planned and the blade might end up moving in a direction you did not intend.