What's your "best" fiber outage root cause? How's "the island is leaking"?.

I've seen fiber cuts due to back hoes, drivers hitting telephone poles, data closets getting flooded, rodents chewing through wires, etc...

I just saw this image on the front page: http://i.dailymail.co.uk/i/newpix/2018/05/06/03/4BE7272900000578-5695425-image-a-37_1525574205390.jpg

What's your "best" root cause item for an outage?