Today at work I witnessed a swarm leaving the hive. The bees were flowing out like water. The position of the sun (morning) made it hard to get a clear video, but I think you can make it out. It was amazing to watch. One of those rare things, like a piping queen, that you only get to experience every once in a great while. Even with as much effort as we put in to prevent swarming, I'm glad I was able to see this.