"Now lady you must bare in mind that the cards are symbolic and not necessarily literal". The gypsy looked worried as she looked at the card and this apprehension was mirrored on the face of the lady.
"Please can you show me the card?"
"It may only be symbolic"
"Just show me the card!"
Reluctantly the gypsy turned the fateful card over for all to see and it bore the sign of the gullible cow.

"I stayed up all night playing poker with tarot cards. I got a full house and four people died." Steven Wright joke. They must be magic...

The ‘readers’ are often very, very good and reading body language and facial micro expressions.

Don't know how they work, and it's certainly not something I waste my time thinking about. So I guess I'm not qualified to answer this. No wait, I am a rational thinker...