What kind of jokes can make a strict teacher laugh?

& lt& lt In physics class, the teacher said, What will happen if my left hand holds the right hand and my right hand holds the negative? I said something reflexively, and your brain lit up, and then I was asked out of the classroom and invited my parents. ...

& lt& lt On a trip, I saw a boy who had passed the security check with a backpack. The security guard shouted, "Come and pass the backpack through the security check!" " At this moment, I saw a middle-aged woman muttering, "Why is it so strict now?" Then, she silently put the fried buns that she had just bitten on the conveyor belt.

& lt& ltz remembers that when I was a freshman in high school, I took the geography exam and failed the whole class.

The geography teacher was furious: "40 points in the blank, but someone got 10?" 20 points? Those who get 10 to 20 points stand up and copy the papers ten times! "

At this time, the deskmate sighed: "I almost got 2 1 that time."

When I was glad, a buddy behind me also sighed faintly: "I almost got 9 points."

My deskmate and I collectively petrified. ...

Satisfied, please adopt.