Someone phoned an Arkansas Holiday Inn at 6:00 in the morning, identified himself as an employee of the fire sprinkler company, and told the clerk to reset the firm alarm by pulling it. That of course set off the alarm. He then told her that in order to stop the alarm, she had to break the hotel windows. Then break off the sprinkler heads at the pipe. Then shut off the entire electrical system. Then... call the hotel manager.
Full story and pictures at The Smoking Gun.