Every 1099 provider has at least one. For me it was the $20,000 unchecked box I posted about earlier. Before that, it was signing a contract with tail coverage buried in paragraph 14 — found out six months later it was going to cost me $18K to leave.
Drop yours below. One sentence or three paragraphs — whatever's useful. We all learn faster when someone else has paid the tuition already.
No judgment. These conversations don't happen in hospital break rooms because nobody wants to admit the expensive lesson. They happen here.