Gum and Grandmothers

I was sitting in the bleachers of Elijah's last baseball game when one of my friends child saw his grandmother walking across the grassy field toward us. He took off in a lightning fast run, Nanna Nanna do you have any gum? I thought I would fall of the bleachers laughing. why? Because everytime any of my children see my mother-in-law in church they start in Nanny Nanny do you have any gum? When my mom comes over: same thing, Camel Gramma do you have any gum? I was thinking, I remember doing the same thing to my Grammy when I was a kid too. So, Here is my question of the day....What is the deal with gum and grandmothers??