"Class, if my glasses are not returned in 2 minutes, the highest grade available will be a B. In 5 minutes, a C. In 6 minutes, a D. In 7 minutes, you will all fail."

Threaten to give them.the toughest exam that they will never pass and is worth 95% of their grade, if they dont confess.

Ouch fyl OP. Well not all kids are born angels. Sadly they're probably they'll probably not understand why what they did was wrong for at least the next 10 years. Why not threaten them, as in "If someone doesn't return my glasses, within the next five minutes, all of you get twice the homework". Also, consider contacts when dealing with rascals. Bring spares too.

I hate students like that. that is why i could never be a teacher.

That's horrible! I always got mad when kids in my class would make fun of teachers!

your clearly in the wrong here, if it took u 25min to act like a teacher, man up and tell them that if u don't get your glasses in 2min your going to the school cops and having those them searched

Rofl. In my school, we woulda never done that

They wanted to have a good time:)

I have a teacher like that, only he's really fat (the turtle shell) but has the tiny turtle head

Kids can be cruel, but they do something like that because they like and trust you and not fear you... So figure out who did it and fail their butt!