There’s a lot of the following going on in my Photo 1 class:

Professor: “While on the left picture the background is IN focus because he used a smaller aperture, on the right picture the background is blurry as a result of a much larger aperture.”

Guy in the back: “Soooooooooooo, how did he make the background so blurry in the second picture? Is he moving the camera or something?”

If this doesn’t stop soon I’m going to start bringing a rolled up newspaper to class.

EDIT(3:44pm): I just remembered another one:

Professor: “This photographer is famous for his printing technique which makes his pictures look as if they were paintings.”

Guy in the back: “Woooooowww. Those pictures look almost like paintings.”