Here is a dramatic play idea which also can be used with music.
Children can pretend to be popcorn with the following idea.
Using a roll of masking tape make a large circle on the floor. Have the children go into the circle and tell them that they are popcorn Kernels. If they do not know what kernels are maybe you would want to have some on hand to show, also you may want to have a popcorn popper too. Tell the children to pretend that they are tiny kernels of unpopped popcorn and ask what they think will happen when the popper is on. If they are not sure show them and soon you will have several popped kernels.