... nice one, Les!

Reminds me of the where a guy went into a joiner's shop and asked for some f hardboard.

"", said the joiner ... "there's no 'f' in hardboard"

"I know there's no 'f' in hardboard", the customer replied ... somewhat irritably

... that's what I've been trying to tell you", the joiner explained patiently ... "there IS no 'f' in hardboard!"