I have a friend who would eventually become a stunt man, but well before that and fresh out of school/home, he found traffic cones on his street one day. At night he'd climb these huuuuge pine trees—we're talking around triple or more above powerline height and taller than most apartment buildings nearby—and place one right on top.
This would go on for several months, climbing a new one every couple weeks and a new cone.
Eventually this caused so much confusion, the city news and papers covered it. People didn't know what was going on, think council was marking trees for cutting, police were patrolling at night. Never got busted.