A child goes up to their mom.
The child looks at their mom and asks, “Mommy, why are some of your hairs gray?”
A little embarrassed, the mother comes up with an explanation that would be easy for the child to understand saying, “Well, those are my sad hairs. Every time you make me feel sad, one of my hairs turns gray.”
“Oh,” the child responds thinking on the answer. After a moment, they look up and ask, “So what did you do to Grandma?”