It was on TV and I cannot remember exactly what it was for. It was almost like letters were floating in an oil – in 3d space (x,y,z). Every once in a while, some of the letters would gather up and form words from the mass of other letters in the oil. They would then break apart and become random again. This would continue – I think it was for credits for a TV show? The great thing was it looked like the letters interacted with each other, had physical properties and banged into each other…sound familiar?