Psychologists from Oxford University found that playing Tetris shortly after a trauma helped erase bad memories and reduced distressing flashbacks.
After waiting for 30 minutes, 20 of the  volunteers played "Tetris" for 10 minutes while the other half did nothing. Those who had played the computer game experienced significantly fewer flashbacks over the next week.Researchers explain that Tetris "uses a large part of the mind" and that it "may work by competing for the brain's resources for sensory information...it specifically interferes with the way sensory memories are laid down in the period after trauma and thus reduces the number of flashbacks that are experienced afterwards." However, they are unsure whether other "computer" games would have the same effect. Since the psychologists chose Tetris because it involves "moving colored building blocks around," it follows that Dr. Mario should also be effective. After conducting my own research over the past 18 years, I can say (without any medical or scientific data to back me up) that taking a trip to see the good doctor - Dr. Mario, that is - would indeed produce the same, if not better, effect. [via Lifehacker]