concrete

Have you ever been tempted to leave your 'mark' on wet concrete? Seems simple enough. But there can be limits. I guess guys with hardhats and the orange const cones aren't enough. Maybe next time they should post some signs?

Is there any truth to getting flat spots if you store your bike on concrete? I dont have mine on the center stand (should do that) but it sits on concrete during the deep freeze for about 4-5 months, and just wondering if I should have it sit on a couple pieces of plywood of the like. Anyone??