With the FujiXT-1 the double exposure setting works like a film camera - the images have to be taken consecutively. However, unlike film cameras you can see a feint outline of the first image, then you superimpose the second. Of course the element of surprise is considerably less, but for me it's the thought process I enjoy and yes there are still some surprises when the image pops up onto the screen.
He's Waiting.
Teenage Baby
Grief