My windshield cracked this morning. I got a chip on Friday in the lower left, and this morning, driving into work, there was a mild 'kersnap' sound and I watched it spread from a teeny finger to halfway across my field of view in the space of about 5 minutes. I picked up my boss at the auto shop, and by the time we got to work it had curved back down and split all the way to about an inch from the far corner of the window. Pretty incredible to watch, actually. And it sings when it does so, just barely.
Fascinating in a materials science way and RARHG$%&*@#@**!!! in a "That's my BRAND NEW CAR" way.