Sometimes, usually in my lower-level/non-majors classes, when I give a test, someone walks in who I usually don't see in class very often. They usually look disheveled, as if they've just woken up (even in afternoon classes), and ask me "I don't have a pen to take the test with. Can I borrow one?"
So, here's someone, who either knew there was a test and didn't bring the ONE thing they needed, or didn't know there was a test, luckily came to class anyway, and was.. what? Expecting to sit through an hour-long (sometimes two hours long) class without taking a single note? Really?
I give them the pen, but I mentally say to myself "The drop deadline is in 2 weeks. See you then." Usually, I'm right.