I can confirm that there is at least 1. It is in the middle of the walkway, next to a pole. It slowly rises when a family sits down. As they go for seconds at the buffet and come back, it is like a show. They will eventually tell the waitor/waitress about it, not trying to complain. We all laugh as she/he tells them whats going on and lowers it with a tool. I was about 10 when I saw it for myself, but it has been a while. I never sat at the table. I recently heard about more tables, which must have been put in after the last time I was there. I heard one lowers somehow or spins.
Never been back since because like all other food there, it is way over priced like fair food. Just go to Wendy's or Taco Bell before going, unless you have lots of food in a backpack prepared to take in. If you have the money and want to see it, be my guest. I wont be seeing it again until the prices are reasonable again and I doubt that will ever happen.