Oh, joy. It’s that time of the year again—Christmas in the city. That means the huge tree is up at Rockefeller Center, the city is sparkling with lights, and the tourists have taken over every inch of midtown Manhattan.

It’s also time for the annual office holiday party. At every firm, there’s someone who’s tasked with the thankless job of keeping the party under control—lest the Bad Santas get out of the bag.