In middle school, class was letting out and my best friend and I were walking to our buses. He had to stop by the music room to pick up his instrument to take home, so I told him "goodbye".
I kept walking, turned around the corner and he popped out of another door with his instrument and startled me on purpose. We walked and talked for another minute and as I was walking away from him to get on my bus I told him "goodbye for good this time".
That weekend he was killed in a car crash in front of his house, he was ejected and his family's car rolled over him.
Now I relive that last interaction I had with him every once in a while. Definitely creepy.