My Dad was a very blunt person, who's routine was very important to him. The first time my parents had a get-together at their house, at 9 pm, my Dad stood up and said, "Everyone needs to leave now, it's time for bed."
Everyone was surprised, but they did as they were asked, and once everyone was gone, my Mom told him that it wasn't appropriate to just tell everyone they had to leave like that. So, the next time they had a get-together my Dad stood up at 9 pm, he said, "It's my bed time, my wife can tell you when to leave."