Show and Tell...

The teacher asked the students to bring one electrical appliance for
"Show & Tell," and the next day every kid had something.

The teacher asks Wendy: What did you bring?
"I brought a Walkman."

"And what is it for?"
"You can listen to music with it!"

"That's nice Wendy. What did you bring Kenny?"
"I brought a 'lectrical can opener, it opens cans!"
"Well done, Kenny.

Umm, Johnny, I see you didn't bring anything!"
"Yes, I did. It's in the hall."

So the entire class goes into the hallway.

"Umm, Johnny, what is that?"
"It's a heart/lung machine hospitals use to keep your heart going."

"Whoa. What did your father say about you bringing this?"

"He said, 'AAAARRRGGGH!!!'"