For me it’s time signatures in music. I grew up playing instruments, played in several orchestras, etc. But no matter how many times someone tries to explain time signatures to me, it makes no sense. I don’t understand why people place such importance on it. To me, notes have a pitch and a duration, maybe some dynamics. That’s it. I don’t understand why people try to needlessly complicate it. It doesn’t give you anything.
My wife will hear a song and go “Oh neat, it’s in 5/8.” And I’m like “How tf do you know that, and why does it matter?”
Slippery/sliding/rolling things underfoot.
I wanted to learn how to skateboard when I was a kid. I tried for several weeks, with a friend trying to teach me. I got tired of hurting myself, and gave up.
I know people don’t “grasp it easily”, but most people eventually get the hang of it, and it doesn’t seem to take them long.
Over the years I’ve tried roller skates, ice skates, and skiing. And, failed at all of them.