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Ashtray suddenly fractured

  1. Oct 22, 2012 #1
    We have an ashtray on an elevated table in our balcony.

    No one was outside and it suddenly fractured into 4 nearly even pieces on the table. Strangely enough, all the cigarette buds were lit.

    This is the ashtray we used:

    http://www.walmart.com/ip/Anchor-Hocking-5.75-Glass-Ashtray/17693180

    My question is, how do you think this thing suddenly broke with all the cig buds lit?
     
  2. jcsd
  3. Oct 22, 2012 #2

    tiny-tim

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