Nah? I'd be afraid if I found out one was swimming nearby, but it isn't something I think about, and I find them kind of cute. Plus, I know they aren't typically aggressive.
No, unless I became the most hated person in the world like a certain man in a certain country that most of the world has currently turned it's back on.
Walking along a cliff edge with nothing but the ocean crashing against the rocks below you?
Not really. If I'm falling eternally, that means I'll never hit the ground and die. So I can just make a game of it and goof off while falling to pass the time. : D
Not really, prosthetics keep improving every year, so chances are I'd eventually be able to get robotic arms that work decently. Obviously I'd prefer to keep my arms though.