why did my bathroom sink randomly explode?

So it’s one o’clock in the morning and my boyfriend gets up to go to the bathroom. Then a few minutes later I hear a loud boomand I go running to see what happened. There is a large crack down the side of our ceramic bathroom sink all the way down to the metal piping. My boyfriend is startled and Confused and mumbles something abOut his head hurting so i think one of the chunks shot off and hit his head. There is no way he could have broken the sink accidently by falling asleep or anything. The sink has been making a strange dripping sOund lately and there has been weird sounds in the walls around the bathroom and the toilet has been acting up. What could have made my sink randomly explode?

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