I can't believe I never thought to do this. Reddit user enigmaisdead posted this photo with the headline "I'm going to start carrying chalk with me everywhere. This may be my new favorite thing to do and I believe I first saw it [on Reddit].

My kids have lots of sidewalk chalk. They won't miss one stick if I stash it in my truck and point out parking flaws. Even better, it's not vandalism! Sooner or later the chalk will wear off or wash off in the rain. Might be tricky in the winter though.