HAHAHAHAHA!!!
I love how the invention of the (known today as) multiple choice bubble sheet and scaner came to be.
The Big Test, page 37 (just in case you missed it)...
"As a farm boy in Minnesota, he [Johnson] had tormented his older sister's dates by scratching pencil marks on the outside of the spark plugs on their Model T Fords. Because lead conducts electricity, the pencil marks drew the sparks away from the spark plugs when they tried to start their cars and the engine couldn't ignite, ha-ha."
I love it! I love it!!!!! WHo woulda ever thought!