Unlawful Loan
  
When Benny the Loan Shark lets you borrow 30 large to pay gambling debts, that's unlawful. It's a loan, but it's not legally done. There was no filing of the details. No fair practices standards adhered to. It was just a smile and a wink and a "you'll pay us back or else" vibe.
Yeah, you don't wanna go here.
See: Payday Loan.