I got an Email from someone who wanted to buy some tapes wholesale. When I told him that i don't sell tapes he sent another Email telling me that he would pay me 500 to order the tapes (in addition to the cost) and wanted me to send them overnight.
Sounds like the "I sent you 5,000 by accident - would you reimburse me with 3,000" routine.
Hope none of you get stung