When you try really hard to remember something and then out-of-the-blue it just comes to you later in the day when you stop thinking about it.
A hippy took her ring to a pawn shop to see if it was real gold. She was planning on using the money to surprise her boyfriend to go see the Grateful Dead. After she bought the tickets she stopped to tell her boyfriend. He didn't believe her. "Sorry babe it's really heavy but doesn't pass the acid test"