I was walking to the post office the other day when I saw a guy in a motorized wheelchair who could not get up enough momentum to make off the street and onto the sidewalk in a place where an old road and weird angle made the approach particularly steep.
I had my hands full, but I stopped and tried to find a solid piece on the back of the chair where I could help push.
I was useless.
There was a couple coming the other way, past middle-aged and a little bedraggled. It's a common corner for people who are house-less, and they probably were.
The man motioned me out of the way and physically lifted the chair onto the sidewalk, motor and all.