My glass exploded in my cuboard???

i was in my kitchen wen i heard a shatter. i looked inside my cuboard where i keep my glasses for drinks and one glass had just exploded. i was so confused. nothing could of fell on it, it was wet or anything, it was upside down and its one of them coca cola pint glasses. but i cant think how it happened. if anyone... show more i was in my kitchen wen i heard a shatter. i looked inside my cuboard where i keep my glasses for drinks and one glass had just exploded. i was so confused. nothing could of fell on it, it was wet or anything, it was upside down and its one of them coca cola pint glasses. but i cant think how it happened. if anyone has any ideas id be very interested to hear them! thanks:D
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