I'm sorry, but in America you can get arrested and thrown in jail for doing things that are not illegal.  Police officers will throw things at you and see what sticks in court.  If they have never seen someone do the same before they will invent some new law or modify one on the fly.  If you have a shitty judge, attorney, or jury, you will be screwed.  America is not as free as the rest of the world would like to think it is.  I'm afraid to do MANY things that would seem cool or fun because of our legal system.

Source:  I've been through the legal system once.  Although it was totally my fault.