Getting scammed taught me this incredible business lesson when i was in my 20s. When a guy came up to me with a bunch of speakers and asked me to sell them to him for $400, I thought it was a good opportunity. I searched speaker scan and found out it's a thing. Turns out, not only is it a thing, it has been written about for years. Here's what I learned: it doesn't matter how great the opportunity is, I always take the time. If the person can't give me that time, that's just not for me. Rule 1: Don't lose your money. 2: Review rule 1. I learned that lesson in a parking lot.