St. Patrick's Day is a great holiday that people from all backgrounds celebrate. There are flashy parades, ridiculous costumes, and delicious, green-themed foods everywhere you go. You never know what people will do next in honor of the holiday. In Chicago, they really get into the holiday spirit by dyeing the Chicago River green. It sounds like an incredible feat, but the city makes it happen. The great thing is, someone got a shot of it through an office window on the 32nd floor of a nearby building. Watch this epic timelapse to see the Chicago River turn green right before your eyes.