What are some unexpected ways people have proven they're not just "all talk" when things get really difficult?

Why is it such a big deal in some cultures to leave the last piece of food untouched, and what happens when someone breaks that unspoken rule?
How does confronting a narcissist about gaslighting change their behavior, and why might this be effective?
Do you think there's a double standard when it comes to privacy violations in men’s versus women’s public showers? Why or why not?
Is it easy for you to tactfully let guests know that the evening is winding down and you are planning to get some rest?