Just a few weeks ago, a new regional transportation system called Lítačka (a slang word for prepaid municipal transportation ticket used in some parts of the Czech Republic) was put into operation in Prague and the Central Bohemian Region. The system allows passengers to buy tickets in a mobile application, passengers can also pair their tickets with their payment cards so the validity of the prepaid ticket can later be checked by waving the card near random card readers in transportation vehicles. You could also steal a password reset link right from the unsuspecting user's browser.