I have my hardest final exam coming up in twenty-five minutes…and when I went to purchase new batteries for my calculator five minutes ago, I gave the cashier eight dollars (a five and three ones) for a $6.36 purchase.
Ahh, don’t sweat it. I remember being all addled during finals waaaay back when. It’s only ominous if the exam is in math. 
<snerk>
Or accounting.
Gimme a break! It was a final in advanced cave wall drawing! It was hard!
Nah, I was <snerk>ing at the thought that your days of addlosity were in some distant past… 