The plan was simple one: Compliment strangers and make them smile.
"We jumped in a car and yelled nice things to people... We even used a megaphone!" wrote YouTube comedian Blake Grigsby.
Grigsby drove around the streets of Chicago in a convertible, shouting compliments to unsuspecting citizens, hoping to make their day.
The strategy worked. Instead of ignoring Grigsby's loud praise, people responded with huge smiles, thumbs up and thanks.