Never on investments, but I keep investments simple and low-cost with index funds. A couple of years ago, I received several very threatening phone messages from a debt collector. They sounded very credible, and I was very concerned, because even though I had no debts, I imagined some past forgotten debt - I racked my brains and worried. I did some research, and found the debt collector was out-of state, should not have been making threatening phone calls to me, and was likely a fraud. I actually read recently that the company (based in Ohio) was finally being prosecuted, and that they had raked in millions of dollars with threatening phone calls that effectively scared people into sending them money on prepaid cards.