You are right I usually begin this trick using a "pick a card any card" pattern and then make it be signed assap in example the queen of diamond. then it become red and i asked the spectator to hold it casualy between his thumb and index, thumb up. then before he touch the card i start rushing it a lil bit into choosing a new card so he forget he has the signed queen of diamond in his hand.
I keep the tempo very tight at the end to avoid giving enuff time for the spec to look at the card. "One card has change to red, (Bis), only one card has turn to red, as we can see..." as we realize the new card "3 of spade" hasnt seem to change to red but there is really only 1 red card.
I then spin out a card from the deck and i catch it with right fingers instead of just taking the top card and i ask: "Maybe i can hold the queen of heart for you, i just touch both cards togheter and turn up the queen of hearth face up so everyone can see it has switched hands. Then the spec realize what hapend and look at his card to find out its now the 3 of spade, if he dont or is slow i just tell him to look at his card.
Thank you very much for your advices and critics thats exactly what im looking for. Ill work on the naturel and smoothness of my movement this week-end and i will update the video during next week.
Edited: I came up with a new version the other day and because i had no answer in the tread i decided to update this first topic instead.
http://www.youtube.com/watch?v=SGBPUSYVYlg
Its The second version of my web cam trick and because of the quality of comments i had i came back with a new version wich start to look much more like an illusion. I will polish and rehearse all the moves this week and i will update again.
I first thought it would be very easy to do a webcam trick from something im used to perform in stand up situations. But i can say now it is just as learning a new effect, it requires time patience and dedication as any other performance.
Im glad i post it here or i would probably have take a while for learning this lesson.