@bam94 15 July 2021 more from that month

An engineer, a physicist, and a mathematician are on a train in Scotland. The engineer looks out the window and sees a black sheep. He comments, "Look, they have black sheep in Scotland". Then physicist looks and comments, "From this observation, we can only say there is at least one black sheep in Scotland." The mathematician then looks and comments, "Actually, from this we can only say there is at least one sheep in Scotland that's black on one side."