The door is opened and, as if pushed through, a sort of trolley with a big metal container (somewhat shorter and with a greater diameter than the average garbage can) is pushed into the inn, where it comes to rest vaguely in the middle of the floor, as much as that can be achieved without running into things.

It has a shiny (freshly-polished!) red DO NOT PRESS button, a big one, atop its locked lid, with a few smaller DO NOT PRESS THESE EITHER buttons scattered around it.