Someone contacts you for some bogus reason and asks you if you will park a sum of money in your trust account for them. In return, you get to retain a portion of the money. They send you a check and ask you to send a wire transfer somewhere for the amount minus your cut. The wire transfer gets processed faster than the paper check, so the attorney transfers the funds and finds out a couple days later that the check is no good.
A few years ago, someone emailed me from China, wanting help with some IP transfers or something like that. After a couple emails, he asked me to accept a check for half a million dollars. Recognizing the scam, I said no, and told him not to bother me again. He sent the check anyway-half a million dollars written on an account for a car dealer ship in Ontario. I turned the check over to the fraud investigator for my bank and phoned the car dealership to let them know. Then I emailed the original sender to let him know what I had done and received a suitably venomous response.