It's no secret that it's really cold across the majority of the country.

We've seen videos of people throwing boiling water in the air to see if it would instantly freeze, and a video of a guy jumping on a frozen trampoline.

If you need more examples of how cold it is, watch the video below. It's more of a public-service announcement on why you should make sure your clothes are completely dry before going outside in the polar vortex.

http://youtu.be/5OjDK44zWjY