"Just a tiny red sliver remains in the battery icon. I wish humans came with the same kind of indicator . . . it would make things much easier. You would know how to deal with every person on the planet, and I’d always be in the red."

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The Somebody Else's Problem field is much simpler and more effective, and what's more can be run for over a hundred years on a single torch battery. This is because it relies on people's natural disposition not to see anything they don't want to, weren't expecting, or can't explain.

— Douglas Adams