I'm in grad school, and spend two evenings per week in class. Tonight's class was interesting and informative, full of useful information, engaging and entertaining, but none of that mattered, because I could not get my mind off the cuffs on the professor's sweater. It looked machine-made, but I'm pretty sure I could have reproduced it, if only I could have gotten a good, close-up look at the way the cables met the cuffs!
Fortunately, I was able to restrain myself from walking up to this poor woman after class and saying, "Excuse me, may I please closely examine your shirt for a few minutes? Would you mind just taking it off and turning it inside out so I can take a look at the reverse side? Please? Just for a minute?"
I'm pretty sure that would have meant an automatic F. And possibly a referral to social services.