World's most demented electoral system?

[Yeahsayyeah]

And noone mentions the United States presidential election, where the loser can outright win due to the electoral college?

[Yeahsayyeah]

There have been other systems far more demented, but particular form of PR used in the Weimar Republic was quite special.

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Proportional automatic method with St. Lague (Webster) with a quota of 60,000 votes in electoral districts that usually comprised of a state or a Prussian province. Remainders were collected on a combined electoral district and the Reich level, seats allocated due to the same method. (There was a constraint that only as many compensatory seats could be gained as where gained at the electoral district level.

I don't think, that it is "demented" at all. BTW, it has an interesting side effect of representing turnout.