Photo: via Facebook

According to the extended weather forecast, it's going to be about 20 degrees with scattered flurries on Sunday. Sounds like a great day to go without pants.

The No Pants! Subway Ride returns for its ninth year (fourth in Chicago) of shocking the public this weekend, as hundreds of intrepid transit-riders will ride the rails in their underoos from noon-3 p.m. Why? We're not entirely sure, but we do know that if you plan on participating, there is at least one rule to follow: You have to act like sitting on the CTA in your particulars is completely normal (depending on what line you ride, it just might be). If you're curious, check out the event's official Facebook page for all the details, including where to meet the rest of the group. Because the only thing more embarrassing than wearing your underwear on the train is doing it alone.