Now, we've all been there. Sat in a dull lecture, whether at college or University, pretending to do work, when actually, you're not.
For the clever among you, you'll have a Word document open, or the presentation slides, just in case the tutor picks on you to prove that you're studying.
Usually, you'll get away with it too. Then, you'll continue with your group Facebook chat mocking the teacher, a quick catch up on last night's Love Island (don't deny it LADs, you're addicted too) or flick through Twitter - the more innocent options, of course.
Credit: PA
But now, the tutors are coming back at us with a vengeance, or at least one, from the University of Michigan, US, is.
During a lecture, presumably to do with geography or environmental sciences (as the class title given is EARTH 222 / ENVIRON 232), one tutor put up a 'Things I Noticed' slide during class.
This featured a list of various internet activity - most of which is largely innocent - including: "Watching ESPN, buying makeup and cat videos."
However, look a little closer and there are few anomalies lying around that just make you smile. These include classics like: "Buying $240 worth of turtle necks, photoshopping President Trump onto muppets, and instant messaging a boyfriend to break up with them."
And there's the downright brass of some people who were looking at pornography.
She also marked out those which she'd seen on a regular basis. On this list were: "Wolverine access, Amazon, Facebook, job applications, Reddit, Tumblr and general shopping."
Let the lesson be learnt, you may think you're smart, but the reason the teacher is stood at the front to educate you is because they are smarter than you.
Over the last few days, I bet many of those inside lecture theatres (and those sat in their offices) have been googling when it's officially legal to leave their place of study/work due to extreme heat.
Just how hot is too hot to work? Well, although there's the no official guideline - so you can stop those school rumours of 30 degrees (for now) - the Trades Union Congress (TUC) do want to see maximum and minimum temperatures introduced.
Credit: PA
"In very hot conditions the body's blood temperature rises. If the blood temperature rises above 39C, there is a risk of heat stroke or collapse. Delirium or confusion can occur above 41C," they say.
Featured Image Credit: PATopics: University