There are better ways.

So, while I have still never been arrested, I came pretty close a few nights ago. We decided to try some guerilla marketing. We cut out some stencils of the site, and darn near perfected the method of chalking the website onto asphalt. We erroneously assumed that it wouldn't cause much of a legal snafusis, but on the last spot of ground we were going to tag, it all went sour. A couple of security guards saw us and wondered what was going on. Not really wanting to take the time to explain it all to them, we...uhh...we bolted. Ya, we panicked and bolted. But I am a little dense, and had my car parked there illegally. When we went back about 30 minutes later, there were two cop cars, taking my plates and making some calls. I knew I wasn't going to get out of this, so I went to talk to them.
They played the "Good Cop, Bad Cop" routine to a capitol T. They said they had been on the phone with a tow truck when I came (that coulda' been pricey) and they were about to come to my apartment to question me. They ran the seriel number on my car stereo to make sure it wasn't stolen. Was that for dramatic effect? But long story short, they made us clean it up, and by the end of it all, they thought it was pretty funny, I mean the business and the shirts and all.
Oh, and Bad Cops parting word: "You can bet that most of the guys down at the station will be checking out your site. Who knows, maybe they'll buy a shirt or two."