The young geography teacher asks the older one how to get students' attention during the lesson. The older one says:
"First, you have to shock them, then you have to catch their interest, after that you'll have their attention and just go on with you lesson"
"OK, but can you show me?" - asks the younger teacher
They come in to the classroom and the older teacher shouts to the class:
"HEY little twats! Today's topic is How to pull a condom on the globe... So, what is the globe?.."

*hope I didn't offend anyone)