I love it when u walk to the door of a mathematician...

and you see jokes and cartoons on their door. I know this post isn't for everyone. But perhaps I can put a smile on some peoples faces. In the following, you see my favorite math cartoons that my colleagues at the university have on their doors. Oh and of course I don't have some on my door :) cough cough

Here is my top 5:

Number 5:

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Number 4:

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Number 3:

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Number 2:

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Number 1:

Image Source: here

Do you habe any funny math cartoons? Feel free to comment ;)