Children tend to think of it as a little white dollhouse table, but the white plastic tripod inside your pizza box has an important function. The Package Saver was patented by first-time inventor and Long Island resident Carmela Vitale in 1985. From patent 4,498,586:
A temperature-resistant molded plastic device is described for use in boxes or packages such as pizza boxes where there is a tendency of large cover portions to sag downwardly to damage the soft pizza or other packaged products.
Millions of Package Savers are sold every year for the cost of about 1 cent per piece, but the rising popularity of corrugated Walker-style and corner-cut boxes are leading to its decline.
Woah, I wondered about this for years – mind blown.