In this Mr. Men mash-up perfect for St. Patrick's Day, Mr. Mischief gets a taste of his own medicine! Mr. Mischief is known for playing tricks on everyone, so when tricks are played on him one morning, he wonders who's responsible. Turns out it's a Leprechaun! Mr. Mischief and the Leprechaun decide to join forces. The poor Mr. Men and Little Misses are in for some surprises! But when the Leprechaun convinces Mr. Mischief to dig a hole at the end of a rainbow, Mr. Mischief is in for his own surprise!