When someone anonymously creates an ad on Craigslist advertising that the poster lives in a large metropolitan area and has a free (or very cheap) boat that they've recently inherited and are desperate to get rid of ASAP.
The ad goes on to say that they don't respond to email, but to call any time - and lists the victim's cell phone number as the contact.
It's best to when the ad is posted very early in the morning, thus guaranteeing a daylong swarm of boat related calls, sometimes carrying over into the following days.