Ideas for cool things to do in front of the carmera

We have decided that the third element to the video is to reverse stuff, we came up with an idea of pouring paint out in a mixture of different colours and reversing it, this will look very visually appealing. Another thing that looked cool when reversed is pouring some liquid into a glass, this is because when it is reversed the liquid in the bottle will gain more volume and the volume in the glass will get smaller.