Regarding that moment where information (joke, plot, etc) is delivered in a way such that the audience nearly misses the content of what is said, and subsequently feels an orchestrated false sense of accomplishment at having caught the line and its meaning. I've got a smorgasbord of words that cover the flash of discovery (eureka, epiphany, click, etc) and a few that work for the triumph aspect, but none that mesh the two. I'm certain I've heard this situation described in either one word or at least a succinct phrase. Insight?
Also, eureka and the like may give the wrong sense. I more closely associate them with finding the information or what-have-you all in a flash, whereas this situation is more of bringing information, gathered quickly, into abrupt focus. An epiphany of understanding, not discovery.
Best Answer
Conceivably, the common idiom ...
"the penny dropped"
when the penny dropped, the moment the penny dropped, the penny has finally dropped, etc.
... may be relevant to you here.
(There's also a similar phrase regarding "the other shoe".)