Farmville, slot machines, Modern Warfare 3, and Halo 7 would all like to raise objections. Adults find amusement in similarly mindless tasks. Adults don't find escalators amusing only because a lifetime of experience has made them common. A trip to Atlantic City or Vegas on the other hand somehow turns losing money into entertainment.
But those are repetitive things specifically designed to hook adults. Very young kids are endlessly amused by simple things like escalators and empty cardboard boxes.
