I've long suspected that I've been under surveillance, ever since the Security Intelligence Service began buying my original cartoons some years ago.
I foolishly believed this was because its staff shared my warped sense of humour. But after reading documents released by US intelligence whistleblower Edward Snowden, I realise they wanted my work for more sinister reasons.
Otherwise, why insist that I simply mail the cartoons, rather than using normal undercover communication procedures, such as discreetly exchanging documents and money in identical briefcases at a drop-off point?
They clearly wanted me to lick a postage stamp, to secure my DNA.
Thanks to Snowden's revelations, I recently took the precaution of upgrading my mobile, and to confuse the spooks I've left my GPS position running on the old phone.
Discreetly concealed in a weatherproof plastic bag, the device is now being continuously recharged by the perimeter electric fence at the GCSB's communication station at Waihopai, near Blenheim.
If you call the number you're greeted with a message, quoting Baroness Orczy's famous line from The Scarlet Pimpernel, "We seek him here, we seek him there ..."
Unfortunately, despite my vigilance, I suspect I may yet again be under security observation at my latest rural hideaway.
The property has recently been invaded by countless cicadas. Well, most people would presume they are cicadas, but we paranoiacs known better.
Clearly these are the latest electronic eavesdropping drones, masquerading as insects.
I even found one perched on my computer, presumably extracting the contents of my hard drive.
I've had extensive discussions with my psychiatrist about my latest anxieties and suspicions and he agrees with me - it's a bit of a worry.