Prank calling involves anonymously calling someone and making rude, hurtful comments or lies without the person knowing who is calling. Over a million kids are prank called each year, which can have negative impacts like hurting someone's feelings or driving someone who is depressed to the edge. If someone calls with a blocked number and starts saying hurtful things, hang up and tell parents or authorities. Speaking up can help stop prank calling from negatively impacting others.