ConfusingJazz said:
Don't feel too bad, Penn and Teller are professionals, and have zero idea of how this trick works:
http://www.youtube.com/watch?v=N78YnarbVEA
I...THINK I can see how this one works. It's the last guy--he looks and sounds like he's reading the "last option" on the card.
I think the cards are worded so the players are given instructions to read a specific line depending on their table.
Maybe the cards have two instructions. One is what they're supposed to say if they're at table 1, and one if they're at table 2.
Because even though there's the random element of her switching the cards, if the cards use the process of elimination for their instructions, the last guy's card will be a "default" answer.
Let's remove the "name" part. The cards probably say "Say your name" so that's easy. P and T got that one.
The cards also probably have "say your table number" and the number probably is written on the table somewhere.
So the cards need actually ONE variable. The meal.
If he has six different cards and uses some slight of hand, he doesn't need ALL variables. He just needs to make sure he has the cards that match the meals for TWO tables which he knows the locations of. Even if she "switches" them, he still knows which meal is at which table.
I'm probably getting the math wrong here, perhaps someone can help my tired brain, but I THINK I can see how, with some planning, he can prepare cards in advance:
Table 1 cards:
Say your name, table one, and chicken.
Say your name, table one, and fries.
Say your name, table one, and pizza.
Table 2 cards:
Say your name, table two, and chicken.
Say your name, table two, and fries.
Say your name, table two, and pizza
Table 3 card:
Read this card, and do not say the two meals that have been mentioned.
Say your name, table two, and [chicken, fries or pizza]
Now, how does he prepare for the swapping? That's what I'm gonna ponder when I rewatch it.