Most of us had in history a certain amount of difficult experiences. Often times, there's a friend or family member to film these kinds of events, and here you go the board site. It has a whole lot entertainment moments throughout the internet.
I think the reason otters do that with people is because when they were babies they were able to be picked up and now that they're big they can't. Now when they see something bigger (also friendly) than them, it's an automatic instinct.