Speaking of being wrong, here's a series of doozies on my part. I calculated my students' grades a few days ago at the university. But, I did something wrong in Excel that screwed up the grades. So, I had to calculate them with a hand calculator.
Then, today, the professor called because she had found that I had calculated one kid's grade wrong. I gave him a 55, when he should have had a 73. Eeek! So, I had to get out my grade book and fix them all.
But, I found that I had mistakenly left my grade book in my office. So, I had to make the hour and a half drive back to work to get it. And get someone to teach me how to use Excel. And redo the entire batch of 65 grades. And now, I think I'm done.
But, I'm checking them again tonight, because I'm sure I've done a few wrong.
Please, no jokes about History students and our inability to do math.