For example, a man in Michigan who used a coffee shop's free, unsecured WiFi network to check his e-mail from the parking lot, without going into the coffee shop, was charged with a five-year felony.
http://news.cnet.com/8301-10784_3-9722006-7.html
Luckily for him, the prosecutor wasn't up for re-election (or was), so the felony charge was dropped and he wound up paying a fine and doing community service.
But just picture that - spending five years in prison and losing your gun rights and your vote for the rest of your life for using a free, open, unsecured computer network.