The dyed Chicago River doubles as a perfect green screen in this hilarious video

7:48am PDT - March 18th, 2019    st. patrick's day - Mashable

The Chicago River was dyed green for St. Patrick's day. And for the memes. Every year, Tom Rowan dyes the Chicago River in honor of St. Patrick's day. It's a tradition that started in the 1960s when the mayor decided he wanted to do something festive for the …