Tonight's episode of BBC One's Ambulance shows the horrifying threats of violence faced by frontline emergency service staff.
An operator calmly respond to a caller, who claims doctors are stealing his medication in the latest episode of the documentary.
When the operator asks for his address, he replies 'If you come out I'll start using violence, I'll get a f***ing grenade'.
"If you ring this number, I'lll be coming for you", the caller adds.
The viewer is told the threats are coming from a caller who is nearby the ambulance control centre.
It prompts concern for the safety of staff, and the duty manager instructs security to lock down the building.
Police are called to the scene.
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An operator says they have thousands of calls every week from people with mental health problems.
Ambulance crews encounter dangerous things, 'scary people' and 'scary situations', where there personal safety could be in jeopardy, he says.
When paramedics visit the caller, he tells them his 'blood is boiling' and he feels 'anxious'.
He's suffering hallucinations, he says.
The paramedics calmly takes him to hospital in the ambulance, and they bond over their love of Manchester United.
'You seem a decent guy to me', the paramedic tells the patient.
The episode also follows the story of a biker, Lee, who suffered a head injury after skidding off the road.
Dr Ian and Rob, who rush to the scene in an ambulance, believe he's suffered a brain injury and is put under general anaesthetic.
He's rushed to hospital after his son and wife are sobbing on the roadside.
Later in the episode, two paramedics visit 94-year-old patient Margaret.
Margaret has been struggling to breathe, she tells them.
She tries 'to manage' without carers, she tells the paramedics.
"I usually say no I don't want to go to the hospital", she says, after apologising for calling.
In a heartwarming moment, she shares a cup of tea with the paramedics.
Margaret tells them she did a electrical testing job in the war. She would fit telephones in people's houses, she says.
Margaret has the paramedics in fits of giggles, telling them about her husband Henry.
They met at a wedding, she says.
"I didn't fall in love at all, I gave him up about a three times", she adds.
"I think I fell for his motorbike really", she says, as the paramedics laugh.
"I can sit all night and speak to you Margaret", the male paramedic says.
