This contact form uses a clock captcha, I thought it was a rather fun idea, and anyway a lot less annoying than those barely readable random strings so many sites use. Source code for this clock captcha can be found here (in German, but the PHP code is clean and easily understandable:)
This is planetOzh, weblog of Ozh, a 35 years old dude living in France with an interest for, errr, like, computer things. I have a wife, 2 kids, and one computer-unrelated job. Give my eye a gentle click to read more about me.
Things & stuff (c) Ozh, 1996-2017.
Googlebot, look at Ozh so I'm the first "Ozh" in Google's images damn it.
Probably valid XHTML, but who cares ?
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Pledge your allegiance. I'm a rolling thunder, a pouring rain. I feel so good I feel so numb yeah