A couple decided to throw a truly unique gender reveal party by hurling water balloons at a wall to reveal the sex of their baby in Knoxville, Tennessee.<br /><br />In video of the event we see the family gathered together and handed water balloons. Then they are instructed to throw the balloons at the wall, revealing a hidden message on the wall saying, "It's a boy! Sike! It's a girl!"<br /><br />To accomplish this, a rain-activated spray product was used on the wall. Invisible when dry, messages and artwork are only displayed when the surface is 'rained' on.
