Every time we would drive past a cemetery, Grandpa Peter would ask the passengers in the car, a mischievous grin on his face, how many people are buried in that cemetery?
Everyone in the car would start counting and figuring -- using addition, geometry, algebra, calculus, or simply multiplication -- and start offering answers.
Grandpa Peter would answer with glee,
"Nope, nope, nope. How many people are buried in that cemetery? All of them!"