It's easy to say when it's a full resolution demo on a black background and you know it's fake, but sprinkled into a live action shot and I don't think people n

It's easy to say when it's a full resolution demo on a black background and you know it's fake, but sprinkled into a live action shot and I don't think people notice. This is already something that is being done all the time. Also houdini in 2004 didn't have anything like the fluid simulations it has now.