In the early days of our local rfid-powered public transport payment system, i tried scanning a random misc rfid card from my wallet instead of the correct paym

In the early days of our local rfid-powered public transport payment system, i tried scanning a random misc rfid card from my wallet instead of the correct payment card. The gate locked up and started screeching its "i scanned a card" chime on loop. It was hilarious... and i guess a matter of poorly sanitized inputs.