I did something like that once.This was, apparently, the best exercise of Poker Face I have had in my life, because he was exactly right, and I didn't let on. That was exactly what was happening, strong man, circus horses, dirigible, and all. And I know he guessed it, because he didn't own and hadn't read the book I took it from.
I had a flash of insight that essentially laid bare the core hidden plotline of the campaign, right as we were packing up our stuff after the 4th session, and I just blurted it out to the group. Then we had a month and a half gap in play due to assorted RW schedule conflicts.
When we returned to the table, I couldn’t remember what I’d said, and the DM ruled my PC was fuzzy on his recall as well.