To understand the humour, you had to know a bit about motorcycles. I believe in the earlier articles these were called jesus clips and you would surreptitiously drop one on your friend's garage floor after he finished an engine rebuild. I also learned not to try and clean a gas cap vent hole with an air hose blowing 120 psi and that a bit of scotch tape over that same vent hole would be almost invisible and cause fuel starvation later down the trail when the carbs ran dry.
I used to wonder why I have no friends, now not so much.