Batman Magnets
Not only does Batman understand how magnets work, but with the help of Lucius Fox, he is also able to incorporate Batman magnets into his Dark Knight battle armor. Also, he uses them to hang The Joker’s ransom notes on the fridge in the Batcave. What, you never thought about the fridge in the secret fortress beneath Wayne Manor? Rest assured, it’s exterior is cover with Batman magnets featuring the Carped Crusader and Robin.