I lock my bike with a single u-lock around the back wheel (bike theft happens at the college I go to, but its not too bad). But now I got a shiny new bike to commute on to replace my mongoose beater that broke down, and I was so paranoid about it getting stolen that I had an idea. Whenever I lock my bike up, I turn the brake lever adjustment ALL the way down so the levers hit handlebar before the brakes engage. Only takes a couple seconds, and I have more peace of mind knowing that if my bike is stolen the thief will at least be scared ****less when they discover the brakes don't work on their getaway ride. Hopefully a few broken bones will be involved as well.