This is one amazing video. It is of guitarist Justin King playing both necks of a double-necked acoustic guitar simultaneously, using a combination of hammer-ons, pull-offs and strumming, as well as a couple of percussive knocks on wood.

“Knock On Wood (live)” (QuickTime, 7.1 MB)
Published by
Gareth Saunders
I’m Gareth J M Saunders, 50 years old, 6′ 4″, father of 3 boys (including twins).
Enneagram type FOUR and introvert (INFP), I am a non-stipendiary priest in the Scottish Episcopal Church, I sing with the NYCGB alumni choir, play guitar, play mahjong, write, draw and laugh…
Scrum master at Safeguard Global; latterly at Sky and Vision/Cegedim. Former web architect and agile project manager at the University of St Andrews and previously warden at Agnes Blackadder Hall.
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that video link doesn’t work anymore 🙁
Looks like the site’s been rejigged. That’s a shame, it was one amazing video.
this site works now i cant link it but here it is
http://www.doolinguitars.com/videos/knockonwood.mov
http://www.doolinguitars.com/videos/knockonwood.mov