My grandpa died before i was born. My girlfriend had a dream about him. She said she could "feel" him in the room. She suddenly said: "he shows me his hand, he misses a finger on his right hand". To which i reply: "no, that was my other grandfather, and it was his left hand".

When we told my mom about this she turned pale instantly. She said: "you cant know that". Turns out, my her father missed a finger on his right hand. There is just no way my gf could have known this.