Touch them together to make them stick, or squeeze them between your fingers to hear and experience the squishy squelchy sound! . Throw them at the wall or ceiling to hear them go "SPLAT!". They'll stick for a moment before tumbling down for you to catch and throw again. But be friendly too as you splat, as the gentler you are, the longer they will last. They are durable play toys, but they're not indestructible!