Time travel
I had this dream that I traveled back to 1967 to see The Yardbirds.
I was sitting on the floor in the venue with a group of people -- we were all wearing velvet pants and ruffled shirts. I coudn't let anyone know that I was from the future, but I kept telling myself over and over that I had to be careful that no one found out.
Someone handed me a 45 of Shapes of Things and started telling me something about Jimmy Page.
I held the 45 in my hand, looked at the person who gave it to me, and said something like, "Jimmy's next band is going to be huge."