Three random things I can do, but probably not as well as you

(1) I can snap my fingers, but I use the wrong ones
When you snap your fingers, you probably use your thumb and either your ring or middle finger. I don't. I use my thumb and my first/index finger. This is partly because I have short, stubby fingers, and neither the ring nor the middle finger reaches well enough to the thumb to get a good pop. Plus neither one "feels" right, whereas using my index finger does. So I go with what (at least partially) works.

(2) I can whistle with just my mouth, but I can't do that loud whistle people do with their fingers
Again, something to do with my fingers fails me. I can whistle pretty well through my teeth or using only my lips. But that thing some people do when they stick their fingers in their mouth and produce a loud, piercing whistle? Can't do it. Never understood it. Not even sure how it's supposed to work.

(3) I can back into a parking space, but rarely am I perfectly straight
I don't know why it is, but when I back into a parking space and think I'm far enough back and positioned perfectly between the lines, I almost never am. I'll get out, look at the car and realize I'm turned slightly to the left or the right. Again, not sure why, but I lack the ability to judge my car's true orientation while I'm sitting in the driver's seat. And I'm the one who has largely taught each of our kids to drive, which does not bode well for them.