Just tell them to hold on a minute as you have something on the stove, put the phone down and come back 30 minutes later, generally they have hung up by then.
Or one of my mates who is a bit of a comedian always says, " please stay on the line, this call is being traced by authorities and an arrest team will be deployed to your location immediately."
They generally hang up straight away, and probably spend the next couple of hours with the curtains drawn peeking out the window
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The Daily Driver : '98 EL Falcon, 5 Speed , 3.45 lsd
The Week End Bruiser : FPV BF GT 40th Anniversary, 6 Speed Manual, 6/4 Brembo and lots of Herrod goodies
Project 1 : '75 XB GS 351 Ute, Toploader, 9" with 3.5's
Project 2 : '74 XB GS Big Block Coupe, Toploader, 9" with 4.11's
In Storage : '74 XB GS 351 Fairmont Sedan
XB Falcon Owners Group
Mike's Man Cave