Abstract: A closure for a container comprises means to secure the closure to the mouth of the container and an electronic device. The closure further comprises activation means operative to activate the electronic device when the closure is rotated relative to the container. The closure comprises a lower closure half comprising means to secure the closure to the container, and an upper closure half rotatably mounted on the lower closure half. A container comprising such a closure is also provided. The electronic device could comprise a sound-emitting device, a vibratory device or a light-emitting device.