まさか + Sentence + とは（思わなかった）

[Never expected that; Who would have thought]

Connection: まさか + Sentence + とは（思わなかった/思いませんでした）

Usage: Expresses strong surprise that something unexpected happened. Often followed by 思わなかった (didn't think) or similar.

Examples:

まさか合格するとは思わなかった。(I never expected to pass.)

まさかこんなところで会うとは。(Who would have thought we'd meet in a place like this.)

まさか彼が犯人だったとは驚いた。(I was shocked that he turned out to be the culprit.)