St Patricks Day Evolution of a Leprechaun Human Evolution Graph Tshirt - Great Gift Idea for Men Women Kids. Purchase this awesome looking tshirt as a gift for a friend to help them celebrate this years Saint Paddys Day! Featuring the human evolution graph' with a pot of gold leprechaun placed at the end to represent St Patricks Day. Although it is St Patricks Day themed, the cool design of this tshirt allows it to be worn throughout the year at any time. Wear this on St Paddys Day whilst you drink alcohol and get drunk!!