You're watching someone armed with a 6mm allen key attempt to remove a pedal from the drive-side crankarm on the bench.
First of all you tell them to make sure you have the right thread direction, but the advice is ignored and they proceed to tighten up the pedal. Now they change direction, and you shout "dont be an arse, when that thread gives your hand is going to fly into that 36T chainring!"
They respond with something stupid like "but when it gives Ill just pull my punch a bit and I wont hit the chainring".
Et viola, when the axle finally gives they end up with a spurty 1/2" gash in their thumb, nicely tattoo'd in oily black.
The fact that there was only me in the shed this morning doesnt make it any better 
