Cracked has an article on mentalist tricks.

The one guessing a person's age has me stumped. The algorithm they give works.

http://s3.crackedcdn.com/phpimages/p.../568309_v1.jpg
Age 32

3 (1st digit) x 5 = 15 + 3 = 18 x 2 = 36 + 2 (2nd number in age) = 38

The person says 38 and you tell them they are 32. By subtracting 6. ***applause***

Age 57

5 (1st digit) x 5 = 25 + 3 = 28 x 2 = 56 + 7 (2nd digit) = 63

Minus 6 they are 57. ***applause***

It works with various ages I tried, but how?

This one is even more confusing. I understand you are working backwards from the answer. Page 108 and 9th entry. So you need a arithmetic operation that yields 1089

The random number at the beginning has me puzzled. How can this algorithm work when it must start with a random number picked by the person?

I'm tempted to write a quick program to see if it really works with all 3 digit number (with no duplicate digits) combinations. But I suspect it does. Somehow it yields 1089 every time.

http://s3.crackedcdn.com/phpimages/p.../568569_v1.jpg
741 reverse it 147

Subtract 741-147= 594 Reverse it 495

594 + 495= 1089. It works

Here is the entire article

http://www.cracked.com/photoplasty_2...youre-psychic/