We all know a couple cock-up builders - one unnamed builder in the UK has taken that rep to a whole new level.
The man has been filmed nailing his knob to a plank of wood. For a dare. And then pulling it out himself.
That's some sadistic shit.
We can't afford the rights for this video, so you can watch it here.
Be warned - it's disturbing as hell and if you've got a wanger, you'll probably be clutching to it in vicarious pain by the end.
Also. Do NOT try this at home.