Paul Newton
A guy gets shipwrecked. When he wakes up, he’s on a beach. The sand is purple.

He can’t believe it.

The sky is purple. He walks around a bit and sees that there is purple grass, purple birds, and purple fruit on the purple trees.

He’s shocked when he finds that his skin is starting to turn purple too ...

"Oh no!" he cries, "I think I’ve been marooned!"

Mohammad Al-Tahan
After explaining to a student with various lessons and examples, that:

I tried to check if she really understood that, so I gave her a different example.

This was the result:

David Kutz
Three engineering students were gathered together discussing the possible designers of the human body.

One said, "It was a mechanical engineer. Just look at all the joints."

Another said, "No, it was an electrical engineer. The nervous system has many thousands of electrical connections." The last one said, "Actually it was a civil engineer. Who else would run a toxic waste pipeline through a recreational area?"

Scott Campbell
Three engineers and three IRS agents are traveling by train to a conference. At the station, the three IRS agents each buy tickets and watch as the three engineers buy only a single ticket.

"How are three people going to travel on only one ticket?" asks an agent. "Watch and you’ll see," answers an engineer. They all board the train.

The IRS agents take their respective seats, but all three engineers cram into a restroom and close the door behind them. Shortly after the train departed, the conductor comes around collecting tickets. He knocks on the restroom door and says, "Ticket, please."

The door opens just a crack and a single arm emerges with a ticket in hand. The conductor takes it and moves on. The agents saw this and agreed it was quite a clever idea. So after the conference, they decide to copy the engineers on the return trip and save some money.

When they get to the station, they buy a single ticket for the return trip. To their astonishment, the engineers do not buy a ticket at all. "How are you going to travel without a ticket?" says one perplexed IRS agent.

"Watch and you will see," answers an engineer. When they board the train, the three agents cram into a restroom and the three engineers cram into another one nearby.

The train departs. Shortly afterward, one of the engineers leaves his restroom and walks over to the restroom where the IRS agents are hiding.

He knocks on the door and says, "Ticket, please."

Keith Dellinger
How can you tell introverted engineers from extroverted engineers?

Introverted engineers look at their own shoes. Extroverted engineers look at your shoes.