On this same note, when you're going to a long standing piecing spot, don't tag all over the buildings around it or on the walk there (you know what i'm talking about). This will just turn more people against graffiti, where as if you left their businesses alone they wouldnt give a shit about you walking by to paint a bridge out in the woods.
And if there's graffiti on the back, don't tag all over the sides of the building. Come on. The shit I saw today was rediculous.