When the play Peter Pan first premiered in London in 1904, the author, Sir James Barrie began to hear from parents upset with the play. They asked him to make a change. In the original version, Peter Pan told the Darling children that if they believed strongly enough that they could fly, they would fly. Apparently, children who had seen the play had taken Peter's word literally and hurt themselves attempting to fly. Without hesitation, Barrie altered the script to include a cautionary statement that the children could fly, but only if they had first been sprinkled with "fairy dust." From then on, thanks to the short supply of fairy dust, children were no longer injuring themselves. (1) 

Do you mean a mere play could have such influence on children? Maybe Hollywood needs to be reminded of …