Azhar, who was batting on 93 in the 69th over of the Test, had to dive back in at the non-striker's end when Asad Shafiq drove a Jackson Bird delivery straight to the stumps.
The third umpire, when asked to take a look at the event, was found unsure of which button to press to announce his not-out decision.
And when the screen flashed the decision made by Richard Illingworth, it was confirmed that he had pressed the wrong button.
Commentator rushed to hospital during Pakistan-Australia Test
Azhar, the crowd and all the Australian players went into a shock for a moment but then everyone laughed at the confusion.
The screen soon flashed not-out and Azhar was allowed to complete his ton.
Rain helps Australia as Amir-Azhar onslaught curtailed
What a rollercoaster! #AUSvPAK pic.twitter.com/rrW0wyjZzH
— cricket.com.au (@cricketcomau) December 27, 2016
Pakistan are 310-6 at the end of day two with only 101 overs bowled to them in a rain-curtailed match. Azhar (130*) will continue on day three with his partner Mohammad Amir who scored a 28 off 23 balls courtesy six boundaries.
Here is what happened
This is what happens when you press the panic button! https://t.co/ioyi2C93ng #AUSvPAK pic.twitter.com/yd1EPRaUnX
— Tribune Sports (@ETribuneSports) December 27, 2016
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