Woman from Craigslist shows up. I specifically remove my flip flops outside the door to send her a message.
Woman does not get message and walks in. I specifically stare at her shoes. She still does not get the message.
Suddenly, I feel that I am too tired to tell her something so obvious. So I try to finish our transaction as soon as possible.
What I should have done: Asked her politely to remove her shoes.
What I am doing: Fuming and regretting not telling her, long after she is gone and I vacuumed everywhere she walked. And then, whining some more and writing about it.
Regrets don't always come from telling people what you should not have. Often, they also come from not telling people what you should have.