Keep Your Knives Close!

Probably high time that I told this story!
Many years ago, I went to buy a coffee at the café at work. The usual staff were not there.
Another young lady had been sent there instead. She was struggling with trying to open up in an unfamiliar environment. She had brought her boyfriend with her, but he was not much use and had decided his best approach was to stand by looking gormless.
I waited patiently.
The lady got to the stage of installing the milk boxes in the dispenser. I was familiar with these from my own experience in temp jobs. They have a blind-ended plastic tube. The end of the tube must be cut off before the box can be used.
The poor girl was unable to locate where the usual staff had placed the scissors, or whatever else they used. Futility, she gamely hacked away at the tube with a blunt butter knife.
I took pity on her.
I produced my trusty Swiss Army Knife, unfolded a blade and offered it to her.Swiss Army Ranger
I will admit, at that point I was seduced by the chocolate bar display. I only caught what occurred out of the edge of my vision. It was over before I could intervene.
What happened was this:
The young lady had taken my knife and hooked the blade behind the tube. She had then pulled it towards her. She had assumed my knife was the same as the usual semi-blunt objects she had encountered in cafés. It wasn't.
The edge went through the plastic like it was not there. The girl recoiled a foot or so. Luckily the blade missed her.
“That is a sharp knife!” she exclaimed. She seemed oblivious to the fact that she had nearly just cut off one of her breasts.
I accepted back my knife. Silently, I vowed that in future I would not to lend my blades to other people.
I have been duly wary since that incident. When my girlfriend reaches for certain tools, I cannot help but warn: “Careful! That is sharp!”
She returns this with an eloquent look. Part of it says: “I know! I am not and idiot!” but I think there is also a smidgen of pride that says: “Of course it is, it was you who sharpened it!”.
Morals of this story: Do not assume a tool is blunt. Do not assume someone else knows how to use a tool safely. Never cut towards yourself.