Coming Home at a Quarter of Twelve

A mathematician came back home late at 3:00 am. His wife was very anxious and blamed him for not telling he would be late.
“You're late and you said you would be back home
at 11:45 pm!", she asked.
“I came as I promised in due time. I said I'd be home by
a quarter of twelve."

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Systematic Illusion

Why mathematicians fear driving cars?
Because they are haunted by systematic illusion when switching lanes.

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The White Zebra

A mathematician, a biologist, a statistician went on a safari
journey in Kenya. While they were driving their jeep they were
attracted by a herd of zebras.
The biologist:
“Look, there's a white zebra in the middle of them.
I've never heard or seen a white zebra in my life.
Wow! We'll be the spotlight of all TV crews around the world.
It must be the work of cloning."
The statistician:
“This is not significant since there's only one white zebra."
The mathematician:
“For the moment, we only know about one case of a zebra
that's white on one side."