Figure-toi qu'elle a le pouvoir de repérer tout ça en un rien de temps.
This phrase seems to carry the meaning of "Guess what?" or something, but in exactly what situations would you use it?
When you’re about to say something surprising?
When you’re about to say something you find important?
When you want to add not-so-crucial information as a side note? Does it work like the word "incidentally"?