A teacher has his class fill their pockets with iron filings and stand while he explains the concept of electromagnetism to his students...

"If we see the difference between a milliwatt and deciwatt, you'll notice that the iron I had you put in your pockets is pulling down, what does this prove to us, class?"

A little girl raised her hand and said, "That we get heavier?" The teacher looked at her, rubbed his eyes and said, "No, but you're pretty so you've got that going for you... anyone else?" The class bully raised his hand and said, "We get more dense?"

The teacher contemplated his future as an MMA dummy, and then was about to address the class - until he realized he was a student short...
"Where's Johnny?

Suddenly, the teacher realized the Johnny was missing from the group. Johnny who once proved you could fit twenty firecrackers into a frog, Johnny who used evolution to prove that the shy kid in the back really did come from a monkey's ass... *THAT Johnny*.

"Hey! Teach! I figured out whatcha mean!"

Spinning around and nearly approaching a stroke, the teachers eyes grew to the size of tea saucers as he saw Johnny's hand on the control lever to the magnet.

"Johnny," he began squeakily, "Wha... erhhERMM.. what are you doing?"

"Givin' a demonstration!"

With a slasher smile, Johnny jerked hard on the control lever and the entire group slammed, ass first, into the hard tile floor.

"Watt goes up! Butts come down!"

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