Some Halloween costumes endure through the ages ― zombies, vampires, and slutty cats, to name a few. Others are only topical for a brief window of time ― one year, or perhaps only a matter of months.

In 2012, we've seen pop culture events such as the Olympics, a presidential campaign, a kooky South Korean music video that shook the world, a potential zombie apocalypse, and a lot of women suddenly curious about S&M. If you think these trends will fail to show themselves come October 31, then think again.

Here are the nine costumes we know we'll see on Halloween this year (and then, presumably, never again).