I also ask questions as if I don't already know the answers

I like to pretend in my head that I was there and fill in details in the story that they left out in the most recent telling, then get offended because they don't remember you being there.

i also do this. It feels like shit when they tell you oh you already told me that story.

Yeah, I´m doing this to my grandma. She keeps telling me stories from her childhood and youth again and again, but I still keep pretending that these are new for me, because she´s so happy, when she can tell me these!

I'll just say, "oh yeah i remember you telling me that one before!" and then restate a detail from it like "didn't you say timmy fell down the well? That's crazy!" I feel like they appreciate that you remember.