A Guinness World Record for the Most People Simultaneausly Performing Air Guitar was set at the 2009 Download Festival in the UK. 440 rock fans picked up imaginary instruments and sumultaneously strummed along with Motorhead's "Ace of Spades". bhjs.edu.hk has more than 440 daily visitors, a perfect number to break this record, if all of bhjs.edu.hk visitors met in one place and brought air guitars with them.
The photo above illustrates what bhjs.edu.hk meetup would look like.