If you ask any guy between the ages of 25-35 what the secret password for Contra is, you should get an immediately response that goes something like this:

 

up up down down left right left right B A Start

 

I can guarantee, any guy who played Nintendo as a kid knows this and the very concept itself bonds us men like nothing other.  In fact, it was part of our initiation and presentation of our Man Card, that we must furiously enter this password during opening credits to receive 30 extra guys.

 

All the ladies out there, if you want to give your guy a special card for belated Valentine's Day, or Sweetest Day, or anniversary, my suggestions is to simply take a blank piece of paper and write the aforementioned password on it.  Then sign it with love.  You will have won his heart forever.

 

Picture provided by wikipedia