Taxi uncle saw this at The Bourne Identity...
(Fast forward to 0:40)
So he also wanted to try...
Picture from Stomp.com.sg
Then another taxi uncle saw this at a very old movie...
(Fast forward to 5:10)
And decided to give it a try too...
Picture from Stomp.com.sg
So yes, I think taxi uncles should stop watching so much movies and stick to Ch8 drama series.