Once in front of my colleagues put a piece of paper with some writing closed,
I asked one of them to pick a number between 1-4 (they were drawn in a another piece of paper) he picked 3, then I asked to another write the first veggie name that comes to their mind, he picked Carrot.
I open the piece of paper that I put at the beginning, the writing was 3 and Carrot.
They were amazed, one of them got scared of the situation,
The thing is that I wrote the numbers 1 and 2 smaller than the number 3 and the number 4 was in very bad handwrite, and the most common Veggie that people think first it's carrot
What feels like a "random choice" when someone makes it is probably just the first thing they think of. So if you can make sure they're primed to think of what you want right away you can "predict" their choice. The real skill comes in being able to prime them without making it obvious that that's what you're doing.
I asked one of them to pick a number between 1-4 (they were drawn in a another piece of paper) he picked 3, then I asked to another write the first veggie name that comes to their mind, he picked Carrot.
I open the piece of paper that I put at the beginning, the writing was 3 and Carrot.
They were amazed, one of them got scared of the situation,
The thing is that I wrote the numbers 1 and 2 smaller than the number 3 and the number 4 was in very bad handwrite, and the most common Veggie that people think first it's carrot