Scam: There are tons of variations of scams on Craigslist. Think about scams 1 through 9, and multiply the craziness by a thousand.

How to protect yourself: Don't give away any personal information or money to anyone on Craigslist. And that girl who said she was a 17-year-old Japanese exchange student looking to have some fun? Answer that ad and you'll wake up in Chinatown with a kidney missing.