head-scratching

He became for a short time delirious, in consequence of attempting to comprehend the works of Mr. Nebulous, in which the English language is exhibited casting of summersets, with many prancings to and fro, before earnest-gazing, head-scratching readers, in murkiest obscuration, marvel stricken, with maddest humour and grinning contortions, heels-over-head, wondrous!