Things you could do which are a bit naughty

For those on the lookout for something mildly subversive to do. I don’t endorse these ideas of course.

Draw on an advert
I was reading John Davies‘ post about graffiti artist Banksy, whose book you might have seen around. John puts it better than I could:

Banksy is a subvertiser – keen to challenge the hegemony of The Advertisers who ‘abuse you everyday … butt into your life … leer at you from tall buildings and make you feel small … [are] on TV making your girlfriend feel inadequate. They have access to the most sophisticated technology the world has ever seen and they bully you with it. … However you are forbidden to touch them …’ Banksy wilfully ignores intellectual property rights and sets about altering ads to make passers-by stop and think (‘They never asked for your permission, don’t even start asking for theirs’). It’s the Adbusters approach and it offers deliverance from the oppressive mental environment The Advertisers cage us in.

Plant something
For the less adventurous perhaps Guerrilla gardening is more the thing. The idea is that plants are planted secretly in public spaces in the middle of the night. You’d need to think about the watering too though:

The English climate is pretty good for taking care of regular watering, but the Guerrilla Gardener must carry water because I have yet to find a convenient tap. I use petrol cannisters, they are the perfect water-tight, efficiently-packed portable transportation. But it has caused passers-by to ask if I am a nocturnal arsonist. So be sensitive to their obvious concerns.

Thanks to Rob for the latter link.

Say hello to someone in the street
Sorry, I got carried away there.