I bought my car from a lady who runs a business selling commercial equipment (dump trucks and what not) and she had a thick stack of money orders and checks for thousands of dollars --- all from this exact scam.

Example: She was selling something for $400. Guy sent three money orders for $950 each. He said "Oh no, my assistant sent you the wrong money orders.. please deposit them and send me the difference..."

The creepy thing is: She knew it was a scam, but the bank still deposited the money orders into her account, and SIX WEEKS LATER told her they were fraudulent and removed that balance from her account.