I had to create an account to say how irresponsible it seems at 2:22 when you just plug the wrist strap into the outlet. There is a chance the ground is shorted or incorrectly wired in the outlet, especially in an old house. And of course outlets vary in different regions, at least mention this is only applicable in North America. And since the strap is wrapped around your wrist, it won't necessarily be a quick jolt. Also, the plug looks like it can easily be bent and lose contact since it's taking all the force when you're moving your wrist around putting your PC together. And even though an ESD strap is being worn, at 24:50 it looks like there is a spark when the case side is being slid on.