I'm sure this has been covered before but I thought I would toss it out again. Have you ever forgotten something BIG just as you were setting out for a long hike? Paying the next rent for instance? Your stove (I did that one)? Boots perhaps? Antifreeze in your ride (winter hike a-coming)? Insurance payment? That hot sauce you had on the kitchen table....that you had sooo wanted to use about every meal....
Whatever it was, how did you handle it?