Starting about 4 years ago, when my son was in pre-school, his teacher did an elaborate hoax for St. Patrick's Day. The leprechaun had made a mess in the kitchen, including foot prints across the counter tops, flour flung all over the floor and all the kid's chairs where stacked into a giant tower in the middle of the classroom.
The following year, my son started asking around the house, what the leprechaun was going to do? My wife took the reins on it and that year he moved toy around the kids room, brought and spilled Lucky Charms all over the kitchen table, even hid chocolate leprechaun coins all over the house. When they wake up, it's like Christmas as they go around the house looking for his shenanigans.
Year 3, the leprechaun sleeps in and doesn't mess up the house. Kids wake up disappointed that they didn't get blessed by his mess. He does make a guest appearance while the kids are at school and similar items happen as year 2. "Must have got caught in someone's leprechaun catcher!"
Last year, I got to help the leprechaun out. Glitter was spread all over the carpet down the hall between our bedrooms. Lucky Charms all over the kitchen table. He even snuck into my daughter's room and CLEANED IT UP! Putting her giant pile of clean clothes into a laundry basket (also in her room). Then went over to my son's room, and threw his toys and stuffed animals all over the place. Extending the mess, downstairs we found Babie stuck inside of a flower vase and a t-ball statuette of my son in a small lantern.
Now it's 2014 what will he do this year?