Redditor TheTonz lives in Minnesota where the high temperature was -2F (-19C) on Friday. He wet a set of his kid's pajamas and set them outside to see how they would freeze. The result was a yard sculpture that was easier than building a snowman. On Saturday, the temperature had risen to 26 degrees (still below freezing) and the pajamas had melted "Matrix-style."
An update on Sunday found the pajamas once again frozen hard. How hard?
Hard enough for a child to stand on it. An adult trying that may have left them with broken pajamas. There may be more updates coming, you'll find them at The Tonz' reddit archive.