I think this guy has got the optimal bike locking strategy all figured out.  U-Locks are a bummer because they're bulky and heavy and pull your pants down while you ride, exposing your undies and unsightly ass-crack to the world behind you.  Cable locks are equally unwieldy and pretty lousy at keeping your bike secure.  But the fleece hoodie knotted around the seatpost—my, oh my—it's lightweight and wearable, will confuse a hacksaw-welding thief, and, should your bike and hoodie still be there when you leave the bar, provide warmth and comfort as the summer temperatures climb into the low 60s.