Ah, spontaneously is the word. I've had once where I I did something or other to a steerign column for a friend's truck. An old Chevy, as I remember. The steering wheel spline that held the wheel on didn't have that flat spot that determines how the wheel goes back on.
So, I guessed. It was an older truck. The fellow who had the truck liked the wheel "just so" and he could rest his thumb on it just right. Well, two days later his wife called, his steering wheel had come loose, and he couldn't make the last turn into the driveway, and the truck was at the bottom of the hill.
It was eyars before the little clip over the nut. I was grabbed with guilt, and rushed right over. I got the wheel back on, and tightened up. It was only later that evening that I learn that they had been complaining about it to everyone who would listen. And some young kid with no brains offered to fix it. He musta not tightened the nut with a wrench, the thing was loose the entire next day and fortunately didn't fall off in an intersection.
I'm not friends with them any more.