Maybe you can test the spark by grabbing your bare *** with one hand, touching the spark plug lead with the other hand and running a ground wire from your big toe to the chassis! Perhaps we can get some dummy on weed in Colorado to try this.
I met an old timer at a flea market in Rhinebeck that would run the dip stick across his tongue to taste the oil. The taste was his way telling if the oil was any good. Yook!
When I was young a friend of my Dad's came out of the pool hall. He was asked if he could still do it. I didn't know what that meant. My Dad started the Model A, retarded the spark and the fellow reached in from the passengers side of the engine, grabbed all four spark plugs and killed the engine dead. No thanks