Vacuum Cleaner

A door-to-door vacuum cleaner salesman manages to bull his way into a woman's home in a rural area.

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"This machine is the best ever" he exclaims, whilst pouring a bag of dirt over the lounge floor.
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The woman says she's really worried it may not all come off, so the salesman says, "If this machine doesn't remove all the dust completely, I'll lick it off myself."
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"Do you want ketchup on it?" she says, "we're not connected for electricity yet!"