Earlier this week (I think it was on Monday) I was riding the ferry to work, and saw a sea snake in the water. It was a couple feet long (my guess would be about four, but it was at a distance so that could be way off) and black. A minute or so later I saw another one, and then got the amazing site of a cluster of what I'm guessing was over a hundred of them. They were arranged into approximately parallel groupings in regions, with an overall effect of looking like a line drawing of an octopus.
I hadn't seen a sea snake in the water here before, so didn't think much of it, but then I looked it up online and it turns out hardly anyone else has seen them up here either! There's a species of sea snake native to California, but they live way down south, and aren't even all that common down there. Sitings up here are extremely rare.
Unfortunately I didn't take a picture. Were I used to using my phone camera and had any idea how unusual it was to see that I'd definitely have taken some footage.