I had one of those wrap itself around both of my ankles at the SAME time when we were at Bellows once. Oh my goodness, that HURT!!! They are a pretty blue though!
Oh my goodness! Levus saw a few of them washed up when he was out at Bellows with his shop, and we ran in to one when we were swimming at Bellows before my flight, although it was very small. I wonder how easy it is to remove them from grip? And how long the pain stays after the jelly is removed.