If you stay in Chennai, your Saturday must have been blessed with free metro rides around the city. There was a glitch in the system due to which it was not able to issue tokens aka tickets. Later, authorities allowed the passengers to pass without using smartcards of the tickets for around 2 and half hours. Firstly it was assumed that the glitch was just at one station but later it was discovered that it had been at all the stations. Later paper tickets were allowed; currently the fault has been cured.