Farmers in China are perplexed by the incidence of watermelons exploding. According to BBC report, it was due to the overuse of chemical to speed up growth of the watermelons. The BBC quoted China Central Television for this (CCTV).
Sounds funny; I cannot imagine if you were like living in a nearby watermelon farm, and while you are taking your siesta, you were caught by surprise when you suddenly hear loud bangs! Hahaha, damn watermelons exploding.