Wiktionary
prep.phr. 1 (context idiomatic English) especially; more than other things. 2 (context idiomatic often used as a sentence adverb English) surprisingly.
Usage examples of "of all things".
When stared in face by fangy-toothed necessity, this obesity is capable of all things.
To be at sea, to slide through black water in control of a majestic ship of war, that was the best of all things to Walter Claggett.
So, first of all things, he would go to the old house, and look for Amrah.
Therefore must a man rise above every creature, and perfectly forsake himself, and with abstracted mind to stand and behold that Thou, the Creator of all things, hast among Thy creatures nothing like unto Thyself.
He now became the enemy of all things, and more ferocious than ever.
His mouth tasted foul, his clothes clung everywhere it was uncomfortable for them to cling and his teeth itched, of all things.
There is none who can console me, of all things which are under heaven, but Thou only, O Lord my God, Thou heavenly Physician of souls, who dost scourge and hast mercy, who leadest down to hell and bringest up again.
There was a child's music box with a plastic ballerina on top, a set of wooden salad spoons joined by a metal strip and of all things, a pointer for a Ouija board, but no board.
Elayne frowned at her a moment, then, of all things, folded up her legs and sat beside her!
He hesitated in his deadly purpose, listening to the slow, regular approaching sound, which, feeble though it was, struck mysteriously impressive upon his ear in the dreary silence of all things around him.