CHICAGO -- Today is World Happiness Day.
In honor of such a special day, Paul and Larry wanted to make Robin happy.
So they found three men, dressed in green from head-to-toe, to race against the clock to McDonald's and bring her back a Shamrock Shake.
Watch the video in the player above
The green men joined WGN Morning News to promote the Shamrock Shuffle 8K on March 29.
They say they've been dressing green and running the 'Shuffle' for the last 8 years.
Registration for the Shamrock Shuffle is still open. Go to ShamrockShuffle.com for more information.
Learn more about "The Green Guys," go to https://www.facebook.com/chasethegreenguys