We have a great new thing in Prague's public transport system. You can buy your ticket simply by sending short message from your mobile phone. No need to buy it at a vending machine, to put all those coins inside it and then having the ticket validated in a validating machine. You just write "DPT", send it to the phone number 9020620 and few moments later you have the "SMS ticket" in your phone. Sure, it is a little dangerous when you run down the stairs to the metro station trying to write and send that message... but it is so much faster.