In 1986, rear glass of our parked 1984 Honda accord exploded itself in front of everyone in day time. Passing by people told it happened due to "gas" accumulated inside.
Again once almost in 1993, almost 27-28 years ago, we were going on highway in our Cressida with Masha Allah fully loaded vehicle, car A/c was on since last 4 hours with ventilation knob on "Recirculating mode" and all of sudden, by itself front screen developed crack without any touch, without any noise.
At that time, I remember at time of replacement, glass replacement staff told that it happened due to increased inside pressure (Yes condensation/water droplets were appeared on side windows due to a/c and people inside)