Old Mavis was sitting on a park bench happily eating chocolate bars.
A young man sitting opposite watched her in utter amazement as she finished six of them.
“You know,” the young man said, “I’ve heard eating that many chocolate bars is bad for you.”
Old Mavis raised an eyebrow. “Really? My grandfather lived to be 105.”
“Wow! Did he eat lots of chocolate bars all at once, too?” the young man asked.
“No,” said Mavis, “he minded his own business.”