When setting up a wireless network at home, it's not unusual to be able to connect to your neighbor's unsecured wireless router. Not only can you have used his bandwidth for free, but if inclined, you could have used the connection for illegal activities. If the police came looking, they may not have been able to prove the activity didn't come from one of their computers.

Properly securing your wireless network isn't difficult. Review your routers manual for changing the SSID to something unique, turning on WPA (avoid WEP) for authentication, TKIP for encryption, and using MAC address filtering.

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