to me this reads as if one is making faces to a stanger's baby when the stranger's parents arent looking. so this would only work if the baby's grandparents are present and not looking at the one making faces.
I literally think of that video every time I curl my hair now. Even though I know my hair is much healthier than hers and I understand what temp to use and how long to heat my hair. Still scares me a bit though.