Do not forget your kids
Temper tantrums in children is not a walk in the park. Shouting at a kid to calm down will likely aggravate the situation. Instead, we should try to divert the child’s attention. A different book, a different location, or making a funny face could all help.

Maybe the staff at this place was so tired of little kids touching everything that they decided to put this funny sign to make parents more aware of their children, and also to make them more attentive and careful.