I know exactly what you should do.
1) Write down the phone number on a piece of paper. Also write the phrase "2K, drop is a go" underneath.
2) Also write the number down on another piece of paper, keep it separate.
3) Fold the note with the "2k" phrase so that it fits into an envelope, write "Stan" on the outside of the envelope in large, messy letters (but make sure it's reasonable). Seal the envelope. Don't just fold it and tuck the flap inside, actually seal it.
4) Go to a pay phone. Take out the other piece of paper with the number on it.
5) Call the number. As soon as someone (or even an answering machine) picks up the call, hang up immediately.
6) Tuck the envelope behind the back of the payphone so that it's visible, but also looks a little hidden.
7) Leave the payphone, go home.
8) Don't give money to ####### people on Craigslist.