It's not one of my top five impromptu effects, but it's well worth mentioning.
By Alexander Elmsley: Elmsley's Ghost.
Effect: A card is selected & lost back in the deck, the performer then openly removes four of a kind i use the queen's. the rest of the deck is put aside, the queen's are displayed once more & fanned out face-down. one is touched by the spectator the remaining queen's are thrown face-up onto the table and the chosen queen is snapped smartly, upon which it changes into the chosen selection.the card can be signed &, this effect is a particularly strong for laymen & direct.