The antibiotics thing is nothing new, by the way. I’m pretty absent-minded in general.
My best ever absentmindedness story is this: One semester, my day started at ten in the morning Monday through Thursday. On Friday, however, I had a discussion section at nine in the morning. I could not for the life of me remember that, and so I missed that section at least eight or nine times out of fewer than twenty sessions in all. It wasn’t an excuse. It wasn’t because I was overtired or too busy or because I wanted to sleep in. I just forgot, over and over and over again. So then I’d have to go and find the very nice grad student who taught the class, and tell him that I’d, um, forgotten I was enrolled in it. Again.
What dumbass things have you done?