The perforated ceiling panels also allow dust to fall on you from that yucky yellow fiberglass insulation.
They also allow air flow through the inner skin to that roof vent on top of the blue bird buses. Other manufactures may have the vent to, I'm not sure.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization