This just happened to me too! I'm an idiot and I've actually had success with money orders before so I gave it to him. He said that "his assistant" sent the wrong amount and he wants me to wire the money. Obviously I'm not playing this game so I called off the entire thing.
The person found me on craigslist and said the same thing. They said their assistant sent me a money order for the wrong amount and asked me to money gram the overage back to them.
This guy text me and said he saw my craigslist ad and he's on his honeymoon and he can't meet face to face.but send my info and he will send me a money order for the item im selling,so i decided to google the number and wow it bought me here.