thanksgiving

Thanksgiving doesn't always go well. In fact, sometimes the only thing that's good about Thanksgiving is the food, and even that isn't a guarantee. And no one knows that better than these people...

Every family is different, but there are just some conditions that have to be met before it's REALLY a family gathering no matter who you are.

In this case, "wreaking havoc" means that they are randomly running around Harvard Square and refusing to be orderly. You definitely don't see this everyday.