They have an inner and outer set of moving sidewalks as the loading area for one of the Harry Potter Universal Orlando rides (the one in Hogwart's Castle.) It's extremely disorienting at first but they have lots of staff moving people into the seats, so no one ends up hitting the walls.

We were casually waiting in line for a while, then suddenly we were led into the area to get onto the ride and had a 'holy shit, they're serious about this one' moment.

Edit: the Universal Hollywood ride doesn't seem to have this (as of 2024), so I'm not sure if the Orlando one still does.