Back in high school, a friend of mine brought his Bianchi road bike to school and locked it up to a no parking sign. To mess with him (and to teach him a lesson, I guess) we lifted the bike and lock over the top of the sign and post and hid around the corner when he came to unlock his bike. Shoulda seen the look on his face when his bike was gone! Once he heard us laughing, he figured it out. That learned him.