One of the best scientific animations ever can be found here.

It illustrates the process of leukocyte extravasation, but focuses largely on a protein’s-eye view of the various events that take place inside the cell. You’ll see both the assembly and disassembly of actins and microtubules, the shuttling of the cargo vesicles by the motor protein kinesin, the export of RNA through the nuclear pore complexes, the assembly of ribosomes on the RNA along with translation, the shuttling of ribosomes to the surface of the endoplasmic reticulum, the transport of vesicles to the golgi complex, and the exocytosis and activation of new receptors. Many details are missing and this is only a three minute excerpt from an eight minute animation. Nevertheless, Welcome to the Machines.