1. try putting a capo at the 7th or 8th fret

2. play these open chord shapes: D, G7, D, A7

this means you'll be in key of either A or Bb, depending on where you capo)

3. when playing the D, strum it with a down-up-down-up pattern, and on that last upstroke, lift your fingers off (so you're playing open strings)

4. ignore the fact that in the video he is not using a capo and instead he is strumming those same shapes, only down at the nut, and obviously miming it, and enjoying the fact they are all very stoned and it probably sounds pretty wierd, but who cares because theyre' not plugged in