I've got the story to top them all.
I must have been 4 or 5 years old. My mom did some in-home daycare during the summer for a few of our neighbors who worked, and she had piled all of us into the van and taken us to the grocery store. This was back in the day when you could leave the kids unattended. There were probably 5 or 6 of us in the van while she went in and shopped. Anyway, we decided to "play doctor" while she was gone. Imagine the look on the courtesy clerk's face when he and my mom opened the doors to load the cart full of groceries, and got an eyeful of naked kids! She NEVER went back to that grocery store.
I still tease her about that one, just to see her get flustered.