Given all the attention paid to bicycle theft on the internets, I decided to conduct an experiment in my neighborhood:
In South Broad Ripple, if you park a shiny light blue and silver 18-speed Wally World "mountain bike" with a matching Bell saddle and a Nashbar luggage rack and a sign that says "FREE BIKE!" on your curb on trash day at 11:00 AM, it will take approximately an hour and a half for someone to steal it. The average thief will be dressed like a FedUPS driver (complete with truck) and, when you wave and say "Just sharing the love!", will wave back and smile.
I'm such a hippie.