A 19-year-old who was part of a swatting group—hacking the phone system to get 911 to respond with a SWAT team to potentially dangerous situations in order to harass people—just got sentenced to 11 years in prison.
Their method of hacking used spoofing to pretend the call originated from the victim's house. The team could then say all kinds of crazy stuff. For example:
On June 12, 2006, for example, another swatter, Guadalupe Martinez, dialed 911 using a spoof card to make it look as though he was calling from an Alvarado, Texas, phone number and told dispatchers that he was holding hostages and had killed family members with an AK47 while high on hallucinogenic drugs.
But what really got him and his buddies in trouble was the fact that he showed up at the home of the Verizon investigator that was gathering evidence against him and harassed him. He was arrested shortly after. [Yahoo]