Cruising around town while stealing yard ornaments and putting them in different places. Start at one house and take an ornament, then leave it at the second house a few blocks away. Continue until you get bored or someone gets hurt. Always remember to take something from the last house to return to the first house, it's only common courtesy to make sure everyone ends up with something. Also, massively important to not get caught or arrested.
You: "Duuude we had so much fun last night gnoming until we almost got caught!"
Friend: "Yes, illegally removing yard ornaments in the middle of the night sounds so much fun."