Hear a 'thud-thud-thudding' sound in schools these days?

It is most likely the sound of bottles dropping on the ground.

Ever since a Youtube video of talent show contestant Mike Senatore flipping a water bottle in Charlotte, North Carolina went viral in May, kids around the world have been following suit. The video has now garnered more than six million views and spawned thousands of similar videos.

The goal is simply to flip a half-empty bottle in such a way that it lands upright.

The craze is called bottle flipping, and it is driving parents crazy, according to a CNN report.

Nicholas DeCarlo, 11, explained the addiction to CNN: "Eventually one bottle flip turns into three, which turns into six, 12, 100 and before you know it you're spending an hour on your kitchen table, flipping a bottle."

His father Derrick DeCarlo, says the new trend drives him "crazy". As coach of his sons' baseball team, he frequently sees his players flipping bottles.

"It's amazing how you can have 10 kids all sitting there flipping bottles completely consumed by it and unaware of anything going on around them," he said.

The craze has reached Singapore shores too. On Aug 8, Radin Mas Primary School students celebrated its 90th anniversary by setting a Singapore record for the most number of successful water bottle flips in an hour. More than 1,300 students got the bottles upright a total of 1,588 times.

Singapore youths have also posted videos of themselves flipping bottles.

Tossing bottles however, might still be a less costly exercise than tossing expensive phones to take a 'sel-five'.