Originally posted by Cancerkitty:
No, safety glass is basically two thin sheets of glass that have a layer of plastic between them that holds the glass into one clump when it breaks, instead of shattering the pieces all over the place.

The glass is also tempered (Sonny's wasn't, Carlo's was), which means that it breaks into thousands of tiny pieces rather than larger, sharp ones.

In 1919 Henry Ford addressed the problem by using a new technology, developed in France, called glass laminating. Windshields made using this process were actually two layers of glass with a cellulose inner layer that held the glass together. Between 1919 and 1929 Ford ordered the use of laminated glass on all of his vehicles.

The glass in the rest of the car is different. Around the 1950's the door glass and the back glass changed to a tempered glass. It is just one piece of glass that is sent into an atmospheric oven that heats and quenches the glass to harden it. This tempered or “toughened” glass is also considered safety glass. It is strengthened through the application of heat and pressure. Upon impact it crumbles into rounded glass pebbles instead of shattering into large dangerous pieces.