Or they walk up to you later and ask if you understood that math question that morning and you are like, "uhm.I wasn't here for that," and they are just like "really? I didn't even realize that you were gone." ^^So sad but so true
Teenager Post - That annoying moment when you get fed up of waiting for a page to load, so you close it and in the split second that you do, you can see the page has fully loaded, but it's too late. ~ Happens all the time!