Seriously?
You'd have to be a retard to not know how to operate a bicycle.
( The Gentleman Bastard waxing lyrical. ©, Sat 9 May 2009, 16:38, archived)

I know how to operate a welder
but I'm still not good at it. Knowing how to is not the same as being able to.
( Grrrmachine the indifference engine, Sat 9 May 2009, 16:42, archived)