Forget sticking your tongue to a flag pole. This is the way to prove just how cold it is.

Minneapolis resident Tom Grotting has made a name for himself by placing freezing pairs of jeans to show just how frigid it is.

Grotting says the idea came to him a few years ago when the famed Polar Vortex hit the city with its frigid temperatures. From there it snowballed and now he posts photos on a Facebook page he runs. Still, he says the pants are for one person in particular:

I mostly do it for my neighbor, Diane. The winter gets a little long and she doesn’t like winter very much so it’s mostly entertainment for Diane."

He also posts pictures on his Instagram page and has caught the attention of local media and other imitators on social media: