This might be a good place to bring up the classic Monty Haul problem.

You have a choice of three doors, two of them hide old goats and one hides a brand new car. You want the car, not the goats.

You pick one of the doors. Monty Haul opens one of the other doors to reveal a goat. Now he offers to let you switch your choice to the remaining door before he opens it. Should you switch or not, and why?