If there's anything the Coldplay concert cheating saga has taught us — other than to not have an affair, duh — it's to be on your best behaviour at a concert. 

And if you need another reminder, here it is.

A man who attended Hong Kong singer Fiona Sit's concert at the Suzhou Sports Center Stadium (Sep 13) was caught on the jumbotron gleefully digging his nose, seemingly not even aware that the entire stadium was watching him. 

Well, sir, not only was the whole stadium watching, but the video has now gone viral so the rest of the Internet is seeing it too.

Even Fiona, who was singing on stage, had turned behind to look at the screen, probably bewildered by how amusing the situation was.

The nose-digging went on for a good few seconds until the lady next to the man, presumably his partner, leaned towards him to inform that he was being filmed the entire time.

The man quickly stopped after realising what happened, but surprisingly didn't have much of a reaction either. There was no hiding-under-chairs or turning away from the camera a la Coldplay concert couple - the man just continued sitting there, staring at the screen.

His nonchalant reaction even tickled Fiona, who erupted into laughter on stage.

The singer then started chuckling uncontrollably, even using her hand to cover her mouth, before turning back again to look at the man on the screen, who finally let out a sheepish smile at this point.

It's no surprise that netizens also had a great time making fun of the situation after the video went viral.

"Luckily he didn't put it in his mouth!," one jested. Er, yucks!

Another quipped: "It's quite rare to see someone so engrossed in digging their nose."

Some netizens, however, remarked that the concert organisers "did [the man] dirty", while another noted that the latter "can sue" the camera crew for publicly humiliating him.

Well, what can we say? Next time just don't openly dig your nose outside, okay?

Orh pisai

Photos: hkdaddys