Imagine the scene, if you will. It's a normal workday morning. A colleague from another organisation has arrived for a meeting. As is the normal social convention, I offer him a drink, and he chooses a coffee, with milk.
I select a mug, pour in a teaspoon of coffee, and put in some hot water, and empty the contents of one of those little buckets of milk into the mug. It's all given a good stir, but it looks as though it could do with a little more milk.
Not a problem! We have more UHT pots of milk.
I grab another milk pot, open it up and...
Pour the milk into the bin.
This happens occasionally. If I have something in my hands, and two activities to undertake, I'll do the wrong thing with the item I'm holding. I remember some years back holding a used straw, and a stamp (I was collecting stamps at the time). The straw was to be disposed of, while the stamp when in my album. And I managed to put the stamp in the coal scuttle.
So, we all make mistakes. I grab another pot of milk, open it up and...
Yes. Again. Poured the milk straight into the bin.