van de gekke zijn

Etymology
Literally, “to be of the crazy (one)”. From the television series, where the character Klukkluk would often say dat zijn (toch) van de gekke.

Verb

 * 1)  to be ridiculous, to be absurd, to be insane

Usage notes
Most commonly inflected in the third person singular present tense, otherwise rarely inflected. The most common phrases are dat is (toch) van de gekke and het is (toch) van de gekke.