Variable Change - Interesting concept I learn

While watching movie '21', there was a puzzle which made me think for a while before accepting what was told in the movie. Then one day, I went on internet and searched about the concept of Variable Change. To my surprise, many other viewers had come to internet to find answer to that puzzle discussed in the movie.

It was about a game show where a player is shown three doors behind one of which is the precious gift which the player can win if he correctly tells which door is it.

After little search on net, I found this link on internet useful in understanding the puzzle.

http://en.wikipedia.org/wiki/Monty_Hall_problem

Sometimes, movies just dont stop at entertaining our lives, they do give us other learnings which we otherwise would never come across :)

Cheers,
Sachin