Double writing isn't always an issue there are quicker ways round the writing process (if you know what questions you are going to ask).
Just a quick idea based on Benji's reveal, (not nearly word for word, just an example)
Get 2 post it pads and stick them on a piece card next to each other (they sell them like this) and write a template like this on One (don't make the mistake of doing two)
Our ideal journey would be to_______, If I know the audience correctly their preferred method of travel would be _______ and the whole journey will cost________.
On one pad just write one word boldly, on the other just fill in the same word on the blank space, it takes you less than a second for each word, (as there is so much writing on the template billet this eliminates anyone thinking you wrote it on the stage when they were called also.
A lovely writing dodge is a one ahead, for example purpose you force them the word aeroplane and you have three questions (a destination, a word and an item) you know you are going to force them aero plane so have this pre written on both billets before you start.
(I'll try illustrate)
Our ideal journey would be to_______, If I know the audience correctly the will pick a _______ and the chosen will be aeroplane.
Ask them to name a destination write it on one space (pad 2), do not double write yet (psychologically, the first and last words are going to be where people look for odd behaviour, if the first is clean there mind is at ease).
Our ideal journey would be to France, If I know the audience correctly the will pick a _______ and the chosen will be aeroplane.
Ask them to name and object (double write the name of the object).
Our ideal journey would be to France, If I know the audience correctly the will pick a clock and the chosen will be aeroplane.
(you will notice there is only one blank space left)
Finally ask them the word and when they answer, fill in the last blank spot with the destination as you know the word they are going to shout out is aeroplane.
This reduces the double writing down to having to do it once, in the least psychologically suspected place.Without having to write down
There are rouses to write confabulation stuff on billets without the audience knowing, I agree it is a compromise that could be avoided in order to make the reveal look ultra clean and this the only lacking factor (in my believe).
One is this you have asked them the information bit by bit, (you are going to force them the word aeroplane again) you have performed a piece, then asked them a destination (wrote it on a whiteboard) performed a couple more pieces and asked them an object you wrote this on the whiteboard (you know the third is going to be aeroplane).
Before you force aeroplane (I offer 2 solutions here) you are going to do a name reveal you have already peeked the name, you hold a post it note (the pre written template discussed earlier with aeroplane already written on).
Look at the subject and pretend to be sizing her up for the letters in the name, write down the destination on the template, then the object miss call a letter and then exclaim you are going to try again. In this motion tear off the post it fold it into a quarter (with one hand) place in your pocket.
Ask her to think about the name brightly, make it bold ask her to think of the last letter (write the last letter on the new post it) call it correctly smile and proceed to reveal all the name.
All the information you need for the reveal is already folded safely in your pocket, then just to psychologically sew things up, use the aeroplane force (the billet is already gone!) and then write it down on the white board and call the person with the glass box up
Second one is the exact same premise but my preferred (for which I am claiming rights to), (drawing duplication) rub the stick of half a post it note
Sticky half Not sticky
Fold the billet into a quarter and then unfold it a few times, (this is so when you go to fold it later it will fold instantly) and stick the post it note to a small white board or pad in the upper right corner and fold it (you can cover this with your hand and show board or pad empty then.
Just before you begin the drawing let the post it fold down, then half way through the drawing add required info to billet and as you come to finish the drawing fold it back up and place your hand back over it for the reveal. as you ask for the applause for the subject, turn you back on to casually place white board down peeling it of into a finger palm.
The great thing here is that the white board covers all action
Sorry its not all grammatically correct, just wrote this on the fly!
Hope this helps you in your quest Eric.
Since these are not methods to effects, rather principles (one of my own I shouldn't see them deleting this)