The mayhem began when 67-year-old David Gerrad Collins went to visit his GP on the morning of August 30, the Dunedin District Court heard this week.
After verbally abusing three staff members, the defendant made specific threats to kill his doctor.
Collins said he could hit the man in his car and make it look like an accident.
As he was ushered out of the premises he made it known he wanted to kill "anyone who had wronged him".
His animosity did not abate, and several hours after the fiasco at the medical centre, Collins created a similar scene at a legal chambers where he demanded to speak to a lawyer.
When staff told him he could have an appointment in two weeks he unleashed his rage on the workers.
An hour later he had still not cooled down.
Collins emailed one of the lawyers with the subject line: "hitman employed".
The body of the message simply said: "nz mafia".
The court heard how the electronic offensive continued the next day when he sent his GP’s wife a barrage of expletive-laden messages.
Collins claimed there was a contract out for her kidnap and torture.
He mentioned various gangs such as the Hells Angels, Mongrel Mob and Black Power, but also referred to the "Busy Beess" — not a known motorcycle club.
"You are f..... c...," he ended.
On September 1, Collins hit the Dunedin streets again, his fury this time taking a political bent.
The defendant spoke to an employee at the Hillside Rd offices of Labour MP Ingrid Leary and was ultimately asked to leave.
On his way out, Collins stopped in the doorway and said: "this office is going to get a bomb and so are you".
It was not the first time he had been before the court for his erratic behaviour.
In 2014, Collins was jailed for a month after posing as a police officer when he saw a vehicle collision in Oamaru.
He requested the insurance details of one party then asked the other driver to hand over their car keys.
When they refused he offered them a beer from his bag.
Counsel Brendan Stephenson said Collins’ mental health was "at a low point" but had improved since he had been imprisoned and medicated.
As well as the charges of threatening to kill, threatening to do grievous bodily harm and threatening to harm people or property, Collins was convicted of his eighth and ninth drink-driving offences, failing to attend court and obtaining by deception.
Judge Jim Large jailed the defendant for 18 months but allowed him leave to apply for home detention should an address become available.
Collins was indefinitely disqualified from driving and ordered to pay reparation of $354.
