Kindergarten
A woman has come to the a kindergarten in order to pick up her child home. She has seen saw that all the children are were sitting sits up in the sandbox and playing with their smartphones, while And their governess/teacher/minder slept sleeps on the grass nearby.
"What a the hell!" - the woman cried cry. - "How can you sleep? Your The children can could have run away now!"
"No", - the governess answered. - "They'll not run away. Wi-fi only works only near this sandbox."