AKA: Cyclone Galls
This is only the second time I've seen this phenomena of galls growing on fencing. Biologists say it is a little understood feature of nature. They are thought to be caused by insects interacting with the metal in the fence. In some cultures, the galls are a food source. Often the galls are used as a host to larva. Due to the time of the year these are seen, the insects that caused this anomaly are called April Foolish Buggers. Keep smiling and pass it along.