This is the oldest thing listed on the entire IMDb. I'm glad to have discovered this neat trick where you can literally look at any submission on the entire website. You just type in a keyword and then get rid of the check in the box. This website has literally 5.3 million entries! It's quite nice to get to see the first one. I believe "Roundhay Garden Scene" was technically the first movie ever made.
This is actually a series of photographs, so it probably doesn't count as a movie. It's only 5 seconds long, but it's great to see history in motion! Of course, it's very low quality. I imagine this would be in the public domain so it shouldn't be hard to find. Weird when I make a review longer than the actual entry! I'm sure you have time to see this. ***