What's the difference between introverted and extroverted engineers?

The extroverted engineer looks at *your* shoes...

I met an extroverted Norwegian the other day.

The whole conversation he was staring at my shoes and not his own.

How can you tell whether a mathematician is introverted or extroverted?

The introverted mathematician will look at his shoes while telling you something.

The extroverted will look at your shoes.

How do you know who is the most extroverted mathematician?

He's the one looking at your shoes instead of his own.

What do you call an extroverted snail?

A slug

How can you tell you are dealing with an extroverted engineer?

He's staring at somebody else's shoes.

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