Answer:
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
What comes once in a minute, twice in a moment, but never in a thousand years?
What has one eye but cannot see?
What hangs others yet can unintentionally hang itself?
Take one out and scratch my head I am now black but once was red.
What begins and has no end? What is the ending of all that begins?