The way I catch Leprechauns is by leaving a Pint of Guinness Beer on the kitchen table along with some delicious snacks. I leave a note for them to help themselves to as much beer and food as they want since I have plenty in the fridge. Eventually they get tired and take a nap on the couch. While they are sleeping it's very easy to capture them. I then either get 3 wishes or agree to let them go if they give me their treasure. I then usually buy $HIVE and $DHEDGE with my treasures.