While out for one of my "cold weather" walks (winter coat and boots) my husband left the house to pick up our son. I arrived home while they were gone and, since I did not take my house keys with me, continued to walk in the neighborhood while I waited. After about 20 min. of waiting, I finally called to see when they would return.
Though they were only about 5 min. away, I was informed the front door was unlocked! I could have entered the house at any time!
The good news is, I walked for 20 min. longer than I had planned. The bad news -- I'm an idiot!