Use the power of zero against the fraudster by changing your ATM PIN and include a zero in the new ATM PIN. Say, your ATM PIN could be "9308". Now if a fraudster has jammed the zero in the keypad, you will not even be able to enter your PIN and authenticate your ATM card. In other words, you will discover the ATM keypad jamming even before you authenticate your card. You will leave the crooked ATM and avoid being defrauded. Now that you know, the time to change your ATM PIN is NOW.