Mysterious circular crack on car windshield baffles Reddit users

A peculiar circular crack on a car windshield has become an internet sensation after a Reddit user shared photos of the damage. The user, known as "Downtown_Calendars," posted images of the near-perfectly circular fracture, which left the center of the glass intact, prompting a flurry of theories and discussions online.

The owner expressed bewilderment, stating, "I've never seen anything like it. Not even glass experts." The photograph quickly went viral on Reddit, garnering thousands of upvotes and numerous comments from users attempting to decipher the cause of the damage. The car was reportedly parked facing a garage when the crack appeared.

Online speculation ranged from the logical to the bizarre. The most favored theory suggests the crack resulted from thermal stress. This could have occurred if a previous small chip, perhaps from a stone, was repaired. Rapid temperature changes might have caused the glass to expand and contract unevenly around the repaired area, leading to the distinctive ring-shaped fracture. Another possibility mentioned is a stress point from the manufacturing process, possibly related to the vacuum grips used in the factory.

Other theories included impacts from soft, round objects like sports balls, or even vandalism involving tools such as angle grinders. Some users questioned the absence of glass fragments, while others requested more detailed photos to better assess the damage. However, the scientific explanation of thermal stress on a weakened or imperfect area of the glass appears to be the most plausible cause for the unusual phenomenon.

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I've never seen anything like it. Not even glass experts.