Roombas gone wild proves flat earth theory
Just look at a freshly poured concrete slab for a house. Perfectly flat. It the earth was round, the slab would be round and the Roomba would start going downhill too fast and crash hard into the dog who would run barking through the neighborhood which would prompt worried calls from the neighbors and a full police sweep of the area which would only catch poor teenage Johnny trying to kiss Mary Lou on the front porch before her father came out with a hickory switch. The earth is flat.
