A card visually disolves through a glass window.
A card is selected, signed, then mixed back into the deck. Standing on one side of the window with the spectator, you ask them to push the cards up against the glass and mix them around in a jumble, holding them against the glass.
With the spectator holding the cards on the glass, you walk around to the other side.You pause. You know that the effort you put into showmanship here is going to pay off in a few moments. Confidence is like blood running through your veins.
Perform it on any glass door of any kind
On any car window, even the back window
Can be performed on a glass table top
Can be performed on a house window if you can get to the other side to complete the trick