The Cheese Mites (1903)

Have a look for this on YouTube; it's a partly lost film but 49 seconds exist, of some cheese mites through a microscope. It was originally a short film, bookended by scenes of a bloke being put off his meal.

It's rather pointless expressing any opinion, really, but the context is interesting; one of a series of scientific documentary short films being shown at a time during which film was still something of a novelty.