Vandalize public advertising. The best kind of vandalism is the kind where it looks like it may be a real ad. Example: Find a bus stop ad for Visa. Take a photo. Find the same ad online. Remove the “We’re everywhere you want to be.” slogan and replace it with “We own you.” Print the ad full size and replace the one at the bus stop. Make sure you scope out the way the ad is mounted in advance so you can change it fast.

For a health insurance ad, change the tag line from “We care” or whatever to “We hold your life in our hands.”

If you’re feeling adventurous, make up posters for a film that’s a terrible idea but sounds plausible. “Truckin’: The Jerry Garcia Story” starring Jack Black.

“Peanuts: All Grown Up”

“Miley Cyrus returns to the big screen as Traci Lords”

“The Ron Jeremy Story, starring Jack Black”

When posting your work you have two choices: sneaky or obvious. For sneaky, dress in black, wear a mask, and do it at night. For obvious, wear coveralls and do the work during the day. Make up an official-looking laminate badge with a bogus company name. Write up a work order and carry it on a clipboard. If you can obtain a panel van, use that. The idea is to impersonate a working stiff whose job it is to change the ads. You just do the work and don’t concern yourself with what the ads say.

You would be amazed at what you can get away with if you look like you’re not totally happy about doing it.