When we think of someone who commits fraud, we think of people like Bernie Madoff or companies like Enron: intentional perpetrators of financial crimes. But other kinds of people commit fraud, too. Accounting professor Kelly Richmond Pope explains who else falls prey to the "fraud triangle", and they might be even scarier than the big bads.

0:00 How does fraud happen?

1:00 Meet Kelly Richmond Pope

1:28 The Fraud Triangle

2:18 Three types of fraudsters

2:26 Intentional perpetrators

3:50 Righteous perpetrators

4:20 Accidental perpetrators

5:56 And then there's Wells Fargo…