These teachers couldn’t stay mad at their students for long. They know all too well that sometimes you have to stifle a laugh when a kid does something out of bounds. It might be super funny, but if the teacher laughs, the kids will get rowdy.
Teachers are always confiscating things from students. Some teachers take away phones if they see you texting inside your desk during class. Others have to confiscate paper airplanes, rubber bands, gum, and sometimes even food. All of these things can prove to be a distraction for kids (and as for the gum, that just ruins the undersides of desks).