Most people who meet me, in a house-flat\not-a-tent\seat-centric context find it odd that I want, and will, squat on the floor from choice. It sometimes takes them a while to realize that this is a choice; I'm often in places where seats, in the body of the kirk, have run out. So they assume that I squat on the floor from politeness.
I'm most comfortable when squatting on the floor. I've more-or-less forgotten that I'm odd in this regard. But since my wife and I completed the decoration we have allowed a couple of outsiders in to our house. They have noticed, for they have visited before, that as I have more floor-space that I use it squatting-frog-fashion by choice.
"He can't be comfortable in that position", is what they say, in gist. In fact they look at my wife with lips that suggest that either she is a 'neil mustn't have a chair' nut-job or she's made a very bad life choice in picking me. After all, normal people sit on seats. That's the default position, if you don't like sitting on seats then you have to be somewhat odd.
Why am I comfortable squatting? Because I'm stick-thin and my parents bought hippy leather-chairs. These points probably need a wee bit of explanation. Actually all you need to know is that whatever virtues the leather-chairs' had sitting on them was like being a water molecule in a glacier: you were going downhill. In short: you had to learn how to sit on the carpet.
The carpet was a poly-amide ridge-and-furrow day-glow nonsense that hurt your feet. Or whatever part of your body rested on it.
Hence evolution is true or false.