"The cracks, however, did violate the terms of the M9 contract, so the lots were rejected. Beretta continued production into February and March of 1988 with the affected frames, stockpiling them in hopes of a retrofit. In April of 1988 an engineering change was approved by Berretta and Army representatives that resolved the frame crack issues. The previously rejected lots were retrofitted with the new frame design and retested. The new frames did not display the cracking problem or any other problem during the tests and were subsequently accepted by the military. (NSIAD-88-213) There were 24,000 affected handguns produced with the defective frame. ALL of them were rejected and then retrofitted and accepted by the Army. (NSIAD-88-213)"

http://www.sightm1911.com/lib/history/true_story_m9.htm

Just because the military got some bad frames that were later corrected doesn't mean that a Beretta that you buy in a gunshop is going to self destruct on you. So yes, add that to the UFO, Bigfoot, and dragons list.

Glocks from what I've searched, it seems that Glocks most likely will notmelt in a car. Their frames are made of Nylon 6, which has a melting point of 210+ degrees C, which I don't think are attainable in a car.