This is what my grandfather was like for several days after he had a stroke.

No short term memory, but he was very lucid and sharp. When the nurses asked their standard questions ("do you know where you are", "do you know why you are here") he would use logic to guess the correct answer. The fact that I was in the room (and I live 8 hours drive away) lead him down a logic chain that whatever happened must be very serious and he must have been transferred the larger hospitable that was a few hours closer to where I live.

He would reliably repeat the same conversations based on whoever was in the room with him, and use the same jokes.