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1.
Originating from Berlin, Germany and continuously spreading across Europe, a 'riedl' (noun) is a joke that is meant to be funny but is not funny at all although it still provokes laughter out of the fact that it is not funny.

A joke that is so not funny that it is funny, again, but not because of the content of the joke but rather its stupidity.
Person A: "If Greece had oil, it would be out of its debts incredibly fast."
Person B (making a riedl): "But Greece has oil ... olive oil."
by frenchkid September 28, 2012