Repeating lights and conversations. Last night, I was standing out in the school parking lot with some friends, chatting. As we were talking about places that were hiring in our area, I looked up to see a plane flying overhead. 
I shuddered randomly, and tuned back in to the conversation to hear my friend repeat exactly what she said a minute ago, our friend give the same response, and I looked up at the same time to see the same plane flying overhead. 

I brought it up to my friends, who didn't notice anything had happened.