You may already know this about me, but in case you don't, my thinking process is a bit strange to most people. I remembered this during lunch the other day.
My friend and I often eat lunch together. That day, she and I decided to go to the Italian restaurant in he building where our office is. For lunch, they had a pasta special with your choice of one of three sauces. Two of them didn't sound so good to me, so I ordered the one that was a tomato base with bacon and something. I didn't know the other word, so when the server walked away, I asked my friend what it is in English. Side note: usually, it is kind of dangerous to order things that you don't actually know what it is that you are ordering, especially if you are a picky eater or if you live in a country where things like octopus tentacles and raw eggs are pretty standard restaurant items. Since I am not a picky eater, I ventured.
"Mushrooms," she said. Whew! Luckily, I love mushrooms, so I was pretty excited about that. I told her so. I also shared with her that one of the many things that makes Japan a great country to live in is the selection of mushrooms in any grocery store. There is like a special wall-o-mushrooms set up in every store. There are big ones and flat ones, thin but long ones, short and fat ones, fan-shaped, white, gray, brown, ... I don't know the names of them, so don't ask. There are several varieties that are one big mass at the bottom, with millions of little pegs growing out of it. This is the variety that sparked our conversation. She and I are both English teachers, just so you know.
She told me that as she was teaching class one day, the textbook was explaining countable nouns and uncountable nouns and giving examples of each. ( For you non-grammar-savvy people, a countable noun is a person, place or thing that you can count: flowers, pants, cameras,... An uncountable noun is one that you cannot count: water, time, toothpaste,... You can measure uncountable nouns, but you can't say, "I have 2 toothpastes." You CAN say, "I have 2 tubes of toothpaste.") The textbook listed mushrooms as countable. Some mushrooms are. We don't dispute that button mushrooms are countable, but the block of mushroomage that I described before are not.
So, being the thinker that I am, I tried to picture myself in a grocery store in the States discussing mushrooms with a friend. How would we count them? But that situation didn't seem very natural because I usually don't count the mushrooms that I am discussing. So in my mind, I switched settings. How would I count mushrooms in the middle of a field? That's nature, right? But mushrooms don't grow in fields. So I pictured myself in a forest. But I forgot to picture my friend there, so I had no one to discuss the mushrooms with.
At this point, I laughed out loud. I tried to explain why I laughed to my friend. Can you believe that I really did think all of that in my mind? In that order and everything! I tell ya, with my imagination, life is never dull.