In Atlantis: The Lost Empire (2001), an eccentric millionaire built a steampunk submarine in the 1910s to explore underwater ruins. It's so well-built and maintained, it could go toe-to-toe with a sea monster three times its size for a while. Now THAT is one cool sub. Just wanted to share.
In Mulan (202, Mulan reveals to everyone that she is a woman by shedding her armor charging into the battlefield without any protection. This is because through her chi superpowers, she gained meta awareness and realized that she has plot-armor, so she might as well do whatever she wants.