I stuck my hand in my back pocket today and realized the pocket was stuck together by gum. After pondering it for a while, I realized when I was shopping last weekend, I wasn't near a garbage to throw my gum away so I smushed it between a piece of scrap paper and tucked into my back pocket, probably thinking I'd throw it away as soon as I passed a trash can.
Well of course, I forgot about it and washed and dried my jeans last night. And they're new jeans too.
So what dumb things have you done lately that make you shake your head and think..."DUH!"