I carry a Sharpie marker in my purse. At all times. I cannot begin to tell you handy it is ~ most often it's used to label water bottles or soda cups (you know, because we simply can't cross-contaminate with boy & girl germs! :) but it seriously has made many little tasks easier. I've even been known to cover scuff marks on my black dress shoes... but what else are you supposed to do when you notice the offense right as you pull into the church parking lot?!
More WFMW tips here!