A dumpster having a moveable false floor which moves from a bottom of the dumpster toward a top opening when the dumpster is tilted to a substantially inverted orientation during collection of trash. The moveable false floor has freedom to move a predetermined length toward the top opening, where upon reaching the predetermined length a restraining device abruptly stops the floor causing the dumpster to shake dislodging adhered trash. Upon being returned to an upright orientation the moveable false floor moves back to the bottom.