So, for some reason, I keep thinking that the Thursday a week from the one coming up is the 26th and not actually the 27th. (Got what's essentially a doctor's visit that day, so it's kind of an important date.)
This, of course, sent me into something of a flip-out when I realized that Thursday = 27th. What did this mean for the appointment? Was it actually on Wednesday?? ... turns out it's on Thursday and yes, Thursday = 27th.
Brain, why do you do these things?