For example, I recently made changes to a series of study guides that I handed out to my AP World class. I took an older guide that I used when I last taught the class and then made adjustments for different terms that are in this school's textbooks, changes in the timeframe, and a few cosmetic moves. Only after printing a full class set did I discover that some of the changes that I thought I made (or perhaps had been thinking about making) were not there. I screwed up a book reference that I thought I had fixed and even managed to mangle a title on one.
Earlier today, I received an email from a student asking why there were now several zeroes in assignments that are not even due yet. It took a moment for me to figure out what the student was talking about. I apologized to the student when I remembered that I used that student's line in the gradebook to make certain I had put enough base points into the quarter so that I had a total of a thousand. I do this by entering zeroes into future work, letting the electronic gradebook make the calculations, and then reverting the grades to blanks. This time, I accidently hit "submit" rather than "revert." However, I caught my mistake and immediately deleted each zero manually (or so I thought). The student responded by asking why there were still zeroes in a couple of the grades. Apparently, I missed them even though I thought I had checked every one. (I have since fixed that mistake ... I think).
This evening, I was looking through the packet at the school board meeting and came across a series of resumes that were up for approval. Four of them were in a similar format, but I could not find the names of the people who made them. All I found (or so I thought) was the name of the supervisor of the organization. My friend later mentioned one of the people, and I commented about the lack of names. She looked at me like I was crazy (which is not far from the truth) and showed that what I thought was the supervisor name was, in fact, different names (just a few of them started with the same letter).
However, the worst one--and this has been all too common as of late--occured when I sent out an email to my dissertation committee with my prospectus attached. I accidently also sent my term plan and goals--which was only supposed to go to my committee chair. I then sent a second email to my chair with the term plan and apologized for attaching it earlier to the other email. ... Except it turns out that I didn't attach anything at all to the first email. It wasn't until my methodologist sent me an email today noting that my dissertation wasn't attached (let alone the term plan) that I knew I had somehow made that error. I was certain that I had attached it (especially due to the error I thought I made), but checking my "Sent" file showed no such attachments. Thankfully, I did remember to upload it to Taskstream and my methodologist knew to (and was able to) find it there.
I'd like whatever gremlin that's messing with my mind to stop now.