While wading in the water just off the public beach, Bob saw a convoy of black vans and pursuit cars skid to a halt not far from him in the sand.  As the armed SWAT teams got out, the leader, using a bullhorn, told Bob, “Don’t worry, we’re from the Internet,” but he was not comforted.   Bob realized that he had been caught breaking the rules; he had placed the same ad on Craigslist twice at the same time in the same city,  using two two separate E-mail addresses . . . .  David, Sf.G.