If you don't count "Getting on your horse, riding it 30 feet, and promptly losing it" as a stupid thing done without fail by me (it is definitely that, for what it's worth), it's got to be failing to properly take note of the day or date. You'd think it's not hard to check the calendar and the TV before heading out for the day, yet last time I played I went to bed, saw it switch to "Monday" and then realized I had missed Queen of Sauce. In late fall Year 2. Again. Thankfully these days the reruns aren't as random and it's not as catastrophic of an error as it was when I first made that same mistake, but still. Missed a birthday too, because I checked the calendar as I was heading to bed and realized it was their birthday at 1:30am. Whoops!