Idiom of the day :- Eyes popped out

Usage, examples and definition of the Idiom :-

My eyes popped out when I saw my electricity bill last month. In that case, I wassurprised — even shocked — at what I saw. It’s much better, though, to have one’s eyes pop out when he or she is nicely surprised. ‘My eyes popped out when I saw Miriam. I hadn’t seen her in years.’