I know exactly what they mean.
Customer - 'Can you rip up my tarmac drive while you have a diggger here?'
Me - 'No, I'm using the digger to fix the drain under your lawn'
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Customer - 'Could you just add a stop tap to that 32mm pipe?'
Me - 'Yes, have you got one?'
Customer 'Er, no, don't you have loads in your van?'
Me - 'Er, no, don't you have a kettle in your house?'