Roller-coaster ad on an escalator

The Hopi Hari amusement park in São Paulo, Brazil hired the QG Propaganda agency to create a promotion for their roller-coasters. "Have fun at Hopi Hari's rollercoaster." is what the sign says. The people on each step however are probably screaming WEEEEEEE! at the top of their lungs. link [youtube]http://www.youtube.com/watch?v=ZdnSDXWudoE[/youtube]